Muchas gracias por la respuesta, acá va el nuevo log:

Logfile of HijackThis v1.99.1
Scan saved at 12:34:23, on 18/05/2005
Platform: Windows 2000 SP4 (WinNT 5.00.2195)
MSIE: Internet Explorer v5.00 SP4 (5.00.2920.0000)

Running processes:
C:\WINNT\Explorer.EXE
C:\WINNT\SOUNDMAN.EXE
C:\ARCHIV~1\Grisoft\AVGFRE~1\avgcc.exe
C:\WINNT\system32\ctfmon.exe
C:\Archivos de programa\Microsoft Office\Office10\WINWORD.EXE
C:\Archivos de programa\Microsoft Office\Office10\EXCEL.EXE
C:\Archivos de programa\Internet Explorer\IEXPLORE.EXE
C:\Program Files\SEAGULL\FTP\BZFTP.EXE
C:\Program Files\SEAGULL\FTP\BZFTP.EXE
C:\Archivos de programa\Century\TinyTERM\tt.exe
C:\Archivos de programa\Microsoft Office\Office10\OUTLOOK.EXE
C:\Archivos de programa\Mozilla Firefox\firefox.exe


R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\DOCUME~1\usuario\CONFIG~1\Temp\se.dll/spage.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\DOCUME~1\usuario\CONFIG~1\Temp\se.dll/spage.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Vínculos
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Archivos de programa\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {6155B53B-1872-451B-A422-45E3A921C547} - C:\WINNT\system32\hfbc.dll
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [AVG7_CC] C:\ARCHIV~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [ControlPanel] C:\WINNT\system32\cmd32.exe internat.dll,LoadKeyboardProfile
O4 - HKCU\..\Run: [msnmsgr] "C:\Archivos de programa\MSN Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [ctfmon.exe] ctfmon.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Archivos de programa\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&xportar a Microsoft Excel - res://C:\ARCHIV~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: Microsoft AntiSpyware helper - {2DBC194A-270A-475C-BD86-04EE1E5F6552} - C:\WINNT\system32\wldr.dll
O9 - Extra 'Tools' menuitem: Microsoft AntiSpyware helper - {2DBC194A-270A-475C-BD86-04EE1E5F6552} - C:\WINNT\system32\wldr.dll
O9 - Extra button: Microsoft AntiSpyware helper - {FE9903E4-BE95-4522-886E-010E4D86B7DF} - (no file) (HKCU)
O9 - Extra 'Tools' menuitem: Microsoft AntiSpyware helper - {FE9903E4-BE95-4522-886E-010E4D86B7DF} - (no file) (HKCU)
O14 - IERESET.INF: START_PAGE_URL=http://www.microsoft.com/spanish/msn
O14 - IERESET.INF: MS_START_PAGE_URL=http://www.microsoft.com/spanish/msn
O15 - Trusted Zone: *.skoobidoo.com (HKLM)
O15 - Trusted Zone: *.slotchbar.com (HKLM)
O15 - Trusted Zone: *.windupdates.com (HKLM)
O15 - Trusted IP range: 67.19.185.246
O18 - Filter: text/html - {B01B5C7C-AE5A-4A22-99D6-8FFC118BCB18} - C:\WINNT\system32\hfbc.dll
O18 - Filter: text/plain - {B01B5C7C-AE5A-4A22-99D6-8FFC118BCB18} - C:\WINNT\system32\hfbc.dll
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\ARCHIV~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\ARCHIV~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: Servicio del administrador de discos lógicos (dmadmin) - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - Service: OracleClientCache80 - Unknown owner - C:\orant\BIN\ONRSD80.EXE