Ya he seguido todas las indicaciones que me diste, Hardrive, y de momento, a falta de más uso, parece que las ventanitas no han vuelto a aparecer. Esperemos que siga así.
A las preguntas que me hacías al principio, creo que me preguntas si tengo alguna página red o algo así, y no, no tengo nada de eso. Y cuando formateé, lo hice en los dos discos duros.
Con respecto a los reportes de los escanneres que me pedías, solo puedo mandarte el que me dió Kaspersky porque el de Ewido, después de analizar el disco duro y no encontrar nada, cuando le pedí un informe, me dió un error en el Iexplorer y se me cerró la ventana de internet que estaba utilizando (lo hice dos veces y sucedió lo mismo). Por lo tanto, siento no poder enviártelo. El informe de Kaspersky:


Wednesday, September 20, 2006 4:19:55 AM
Operating System: Microsoft Windows XP Professional, Service Pack 1 (Build 2600)
Kaspersky Online Scanner version: 5.0.83.0
Kaspersky Anti-Virus database last update: 20/09/2006
Kaspersky Anti-Virus database records: 211755


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

Scan Target My Computer
A:\
C:\
D:\
E:\
F:\

Scan Statistics
Total number of scanned objects 24597
Number of viruses found 0
Number of infected objects 0 / 0
Number of suspicious objects 0
Duration of the scan process 00:21:24

Infected Object Name Virus Name Last Action
C:\Archivos de programa\Norton SystemWorks\Norton Antivirus\AVApp.log Object is locked skipped

C:\Archivos de programa\Norton SystemWorks\Norton Antivirus\AVError.log Object is locked skipped

C:\Archivos de programa\Norton SystemWorks\Norton Antivirus\AVVirus.log Object is locked skipped

C:\Documents and Settings\All Users\Datos de programa\Symantec\Common Client\settings.dat 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:\Documents and Settings\Sanfiz\Configuración local\Archivos temporales de Internet\Content.IE5\index.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Archivos temporales de Internet\Content.IE5\KFE3CLMR\television[1].swf Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\ApplicationHistory\cli.exe.72313fbf.ini.i nuse Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Messenger\mcachis@hotmail.com\S haringMetadata\Logs\Dfsr.log Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Messenger\mcachis@hotmail.com\S haringMetadata\pending.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Messenger\mcachis@hotmail.com\S haringMetadata\Working\database_A2B8_99BB_B899_8F0 3\dfsr.db Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Messenger\mcachis@hotmail.com\S haringMetadata\Working\database_A2B8_99BB_B899_8F0 3\fsr.log Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Messenger\mcachis@hotmail.com\S haringMetadata\Working\database_A2B8_99BB_B899_8F0 3\fsrtmp.log Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Messenger\mcachis@hotmail.com\S haringMetadata\Working\database_A2B8_99BB_B899_8F0 3\tmp.edb Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Windows\UsrClass.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Windows\UsrClass.dat.LOG Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Windows Live Contacts\mcachis@hotmail.com\real\members.stg Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Datos de programa\Microsoft\Windows Live Contacts\mcachis@hotmail.com\shadow\members.stg Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Historial\History.IE5\index.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Historial\History.IE5\MSHist0120060920200609 21\index.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Temp\Perflib_Perfdata_1bc.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Temp\Perflib_Perfdata_ac.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Temp\wmv8.tmp Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Temp\~DF364A.tmp Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Temp\~DF366A.tmp Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Temp\~DF6365.tmp Object is locked skipped

C:\Documents and Settings\Sanfiz\Configuración local\Temp\~DF6381.tmp Object is locked skipped

C:\Documents and Settings\Sanfiz\Cookies\index.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Datos de programa\Skype\mcachis\chat512.dbb Object is locked skipped

C:\Documents and Settings\Sanfiz\Datos de programa\Skype\mcachis\chatmsg256.dbb Object is locked skipped

C:\Documents and Settings\Sanfiz\Datos de programa\Skype\mcachis\contactgroup256.dbb Object is locked skipped

C:\Documents and Settings\Sanfiz\Datos de programa\Skype\mcachis\index2.dat Object is locked skipped

C:\Documents and Settings\Sanfiz\Datos de programa\Skype\mcachis\profile16384.dbb Object is locked skipped

C:\Documents and Settings\Sanfiz\Datos de programa\Skype\mcachis\user1024.dbb Object is locked skipped

C:\Documents and Settings\Sanfiz\Datos de programa\Skype\mcachis\user16384.dbb Object is locked skipped

C:\Documents and Settings\Sanfiz\Datos de programa\Skype\mcachis\user256.dbb Object is locked skipped

C:\Documents and Settings\Sanfiz\NTUSER.DAT Object is locked skipped

C:\Documents and Settings\Sanfiz\NTUSER.DAT.LOG Object is locked skipped

C:\RECYCLER\NPROTECT\NPROTECT.LOG Object is locked skipped

C:\WINDOWS\Debug\oakley.log Object is locked skipped

C:\WINDOWS\Debug\PASSWD.LOG Object is locked skipped

C:\WINDOWS\SCHEDLGU.TXT Object is locked skipped

C:\WINDOWS\Sti_Trace.log Object is locked skipped

C:\WINDOWS\system32\config\ACEEvent.evt 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\config\systemprofile\Configura ción local\Archivos temporales de Internet\Content.IE5\index.dat Object is locked skipped

C:\WINDOWS\system32\config\systemprofile\Configura ción local\Historial\History.IE5\index.dat Object is locked skipped

C:\WINDOWS\system32\config\systemprofile\Cookies\i ndex.dat Object is locked skipped

C:\WINDOWS\system32\wbem\Repository\FS\INDEX.BTR Object is locked skipped

C:\WINDOWS\system32\wbem\Repository\FS\OBJECTS.DAT A Object is locked skipped

C:\WINDOWS\wiadebug.log Object is locked skipped

C:\WINDOWS\wiaservc.log Object is locked skipped

D:\RECYCLER\NPROTECT\NPROTECT.LOG Object is locked skipped

Scan process completed.




De todos modos, también he probado la sugerencia que me hiciste tú, AntonioGm, porque nunca se sabe, y si con eso también se soluciona el problema... pues mejor todavía.

Muchas gracias a los dos. Volveré aquí si persiste el problema.