bueno, he hecho todos los pasos y sigo teniendo el problema.
Otra cosa que puede servirles de ayuda es que desde que me pasa esto, también me pasa que al navegar por el explorer me hace un "extraño" la ventana, apareciendo la parte de arriba de azul en blanco y también la barra de tareas de abajo en blanco en vez de en azul. Esto me sucede durante uno o dos segundos, sólo una vez durante esa hora antes de que se me corte la conexión. No se si tendrá algo que ver o no, pero antes no me pasaba.

Este es el reporte del ewido on-line:
__________________________________________________
ewido anti-spyware online scanner
http://www.ewido.net
__________________________________________________


Name: TrackingCookie.Atdmt
Path: C:\Documents and Settings\González Díaz\Cookies\gonzález díaz@atdmt[2].txt
Risk: Medium

Name: TrackingCookie.Tradedoubler
Path: C:\Documents and Settings\González Díaz\Cookies\gonzález díaz@tradedoubler[2].txt
Risk: Medium

Name: Adware.KeenValue
Path: HKLM\SOFTWARE\PerfectNav
Risk: Medium



Y en el Kaspersky on-line he hecho dos análisis:
El primero en Critical Areas:

-------------------------------------------------------------------------------
KASPERSKY ONLINE SCANNER REPORT
Wednesday, August 16, 2006 1:16:23 AM
Operating System: Microsoft Windows XP Home Edition, Service Pack 2 (Build 2600)
Kaspersky Online Scanner version: 5.0.83.0
Kaspersky Anti-Virus database last update: 16/08/2006
Kaspersky Anti-Virus database records: 202711
-------------------------------------------------------------------------------

Scan Settings:
Scan using the following antivirus database: standard
Scan Archives: true
Scan Mail Bases: true

Scan Target - Critical Areas:
C:\WINDOWS
C:\DOCUME~1\GONZLE~1\CONFIG~1\Temp\

Scan Statistics:
Total number of scanned objects: 22686
Number of viruses found: 0
Number of infected objects: 0 / 0
Number of suspicious objects: 0
Duration of the scan process: 00:14:13

Infected Object Name / Virus Name / Last Action
C:\WINDOWS\$NtUninstallKB824141$\user32.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB824141$\win32k.sys Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\dhcpcsvc.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\ndis.sys Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\ndisuio.sys Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\netshell.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\wzcdlg.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\wzcsapi.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\wzcsvc.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\xpsp2res.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB828028$\msasn1.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB828035$\msgsvc.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB828035$\wkssvc.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\dao360.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msexcl40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msjet40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msjetol1.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msjetoledb40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msjtes40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\mspbde40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msrepl40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\mstext40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msxbde40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallQ828026$\msdxm.ocx Object is locked skipped
C:\WINDOWS\$NtUninstallQ828026$\wmp.dll Object is locked skipped
C:\WINDOWS\Debug\PASSWD.LOG Object is locked skipped
C:\WINDOWS\Sti_Trace.log Object is locked skipped
C:\WINDOWS\system32\config\AppEvent.Evt Object is locked skipped
C:\WINDOWS\system32\config\default Object is locked skipped
C:\WINDOWS\system32\config\default.LOG Object is locked skipped
C:\WINDOWS\system32\config\SAM Object is locked skipped
C:\WINDOWS\system32\config\SAM.LOG Object is locked skipped
C:\WINDOWS\system32\config\SecEvent.Evt Object is locked skipped
C:\WINDOWS\system32\config\SECURITY Object is locked skipped
C:\WINDOWS\system32\config\SECURITY.LOG Object is locked skipped
C:\WINDOWS\system32\config\software Object is locked skipped
C:\WINDOWS\system32\config\software.LOG Object is locked skipped
C:\WINDOWS\system32\config\SysEvent.Evt Object is locked skipped
C:\WINDOWS\system32\config\system Object is locked skipped
C:\WINDOWS\system32\config\system.LOG Object is locked skipped
C:\WINDOWS\system32\drivers\atapi.sys Object is locked skipped
C:\WINDOWS\system32\h323log.txt Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\INDEX.BTR Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\INDEX.MAP Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING.VER Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING1.MA P Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING2.MA P Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\OBJECTS.DAT A Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\OBJECTS.MAP Object is locked skipped
C:\WINDOWS\wiadebug.log Object is locked skipped
C:\WINDOWS\wiaservc.log Object is locked skipped

Scan process completed.


Y el segundo en My Computer:

-------------------------------------------------------------------------------
KASPERSKY ONLINE SCANNER REPORT
Wednesday, August 16, 2006 4:05:57 AM
Operating System: Microsoft Windows XP Home Edition, Service Pack 2 (Build 2600)
Kaspersky Online Scanner version: 5.0.83.0
Kaspersky Anti-Virus database last update: 16/08/2006
Kaspersky Anti-Virus database records: 202711
-------------------------------------------------------------------------------

Scan Settings:
Scan using the following antivirus database: standard
Scan Archives: true
Scan Mail Bases: true

Scan Target - My Computer:
C:\
D:\
E:\
F:\
G:\
H:\
I:\
J:\
K:\
L:\
M:\

Scan Statistics:
Total number of scanned objects: 77486
Number of viruses found: 0
Number of infected objects: 0 / 0
Number of suspicious objects: 0
Duration of the scan process: 02:37:28

Infected Object Name / Virus Name / Last Action
C:\Documents and Settings\All Users\Datos de programa\Microsoft\Dr Watson\user.dmp Object is locked skipped
C:\Documents and Settings\González Díaz\Configuración local\Archivos temporales de Internet\Content.IE5\0LCTQ7I3\bo_components_site2[1].swf Object is locked skipped
C:\Documents and Settings\González Díaz\Configuración local\Archivos temporales de Internet\Content.IE5\index.dat Object is locked skipped
C:\Documents and Settings\González Díaz\Configuración local\Datos de programa\Microsoft\Windows\UsrClass.dat Object is locked skipped
C:\Documents and Settings\González Díaz\Configuración local\Datos de programa\Microsoft\Windows\UsrClass.dat.LOG Object is locked skipped
C:\Documents and Settings\González Díaz\Configuración local\Historial\History.IE5\index.dat Object is locked skipped
C:\Documents and Settings\González Díaz\Configuración local\Historial\History.IE5\MSHist0120060816200608 17\index.dat Object is locked skipped
C:\Documents and Settings\González Díaz\Cookies\index.dat Object is locked skipped
C:\Documents and Settings\González Díaz\Datos de programa\Adobe\Acrobat\7.0\Updater\udlog.txt Object is locked skipped
C:\Documents and Settings\González Díaz\ntuser.dat Object is locked skipped
C:\Documents and Settings\González Díaz\ntuser.dat.LOG Object is locked skipped
C:\Documents and Settings\LocalService\Configuración local\Archivos temporales de Internet\Content.IE5\index.dat Object is locked skipped
C:\Documents and Settings\LocalService\Configuración local\Datos de programa\Microsoft\Windows\UsrClass.dat Object is locked skipped
C:\Documents and Settings\LocalService\Configuración local\Datos de programa\Microsoft\Windows\UsrClass.dat.LOG Object is locked skipped
C:\Documents and Settings\LocalService\Configuración local\Historial\History.IE5\index.dat Object is locked skipped
C:\Documents and Settings\LocalService\Cookies\index.dat Object is locked skipped
C:\Documents and Settings\LocalService\NTUSER.DAT Object is locked skipped
C:\Documents and Settings\LocalService\ntuser.dat.LOG Object is locked skipped
C:\Documents and Settings\NetworkService\Configuración local\Datos de programa\Microsoft\Windows\UsrClass.dat Object is locked skipped
C:\Documents and Settings\NetworkService\Configuración local\Datos de programa\Microsoft\Windows\UsrClass.dat.LOG Object is locked skipped
C:\Documents and Settings\NetworkService\NTUSER.DAT Object is locked skipped
C:\Documents and Settings\NetworkService\ntuser.dat.LOG Object is locked skipped
C:\System Volume Information\MountPointManagerRemoteDatabase Object is locked skipped
C:\WINDOWS\$NtUninstallKB824141$\user32.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB824141$\win32k.sys Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\dhcpcsvc.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\ndis.sys Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\ndisuio.sys Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\netshell.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\wzcdlg.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\wzcsapi.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\wzcsvc.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB826942$\xpsp2res.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB828028$\msasn1.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB828035$\msgsvc.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB828035$\wkssvc.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\dao360.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msexcl40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msjet40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msjetol1.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msjetoledb40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msjtes40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\mspbde40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msrepl40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\mstext40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallKB829558$\msxbde40.dll Object is locked skipped
C:\WINDOWS\$NtUninstallQ828026$\msdxm.ocx Object is locked skipped
C:\WINDOWS\$NtUninstallQ828026$\wmp.dll Object is locked skipped
C:\WINDOWS\Debug\PASSWD.LOG Object is locked skipped
C:\WINDOWS\Sti_Trace.log Object is locked skipped
C:\WINDOWS\system32\config\AppEvent.Evt Object is locked skipped
C:\WINDOWS\system32\config\default Object is locked skipped
C:\WINDOWS\system32\config\default.LOG Object is locked skipped
C:\WINDOWS\system32\config\SAM Object is locked skipped
C:\WINDOWS\system32\config\SAM.LOG Object is locked skipped
C:\WINDOWS\system32\config\SecEvent.Evt Object is locked skipped
C:\WINDOWS\system32\config\SECURITY Object is locked skipped
C:\WINDOWS\system32\config\SECURITY.LOG Object is locked skipped
C:\WINDOWS\system32\config\software Object is locked skipped
C:\WINDOWS\system32\config\software.LOG Object is locked skipped
C:\WINDOWS\system32\config\SysEvent.Evt Object is locked skipped
C:\WINDOWS\system32\config\system Object is locked skipped
C:\WINDOWS\system32\config\system.LOG Object is locked skipped
C:\WINDOWS\system32\drivers\atapi.sys Object is locked skipped
C:\WINDOWS\system32\h323log.txt Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\INDEX.BTR Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\INDEX.MAP Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING.VER Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING1.MA P Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING2.MA P Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\OBJECTS.DAT A Object is locked skipped
C:\WINDOWS\system32\wbem\Repository\FS\OBJECTS.MAP Object is locked skipped
C:\WINDOWS\wiadebug.log Object is locked skipped
C:\WINDOWS\wiaservc.log Object is locked skipped
D:\System Volume Information\MountPointManagerRemoteDatabase Object is locked skipped

Scan process completed.