Esegui 
Ho qui un pc di un amico che si è beccato il famigerato problema della pagina inziale di explorer.
Ho fatto una scansione con hijackthis che allego
Logfile of HijackThis v1.99.0
Scan saved at 13.39.32, on 10/02/2005
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2600.0000)
Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\Mixer.exe
C:\Program Files\ASUS\Probe\AsusProb.exe
C:\Programmi\Alcatel\SpeedTouch USB\Dragdiag.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\WINDOWS\System32\RUNDLL32.EXE
C:\WINDOWS\System32\CTFMON32.EXE
C:\WINDOWS\System32\CSRSSU.EXE
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_S10IC2.EXE
C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\wuauclt.exe
C:\Programmi\SpywareBlaster\spywareblaster.exe
E:\spyware\hijackthis\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://default.home
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://default.home
O2 - BHO: SEDP Class - {3BA765C2-08DB-4fe2-9279-311CA10D582A} - C:\WINDOWS\sehlp.dll
O4 - HKLM\..\Run: [C-Media Mixer] Mixer.exe /startup
O4 - HKLM\..\Run: [ASUS Probe] C:\Program Files\ASUS\Probe\AsusProb.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [SpeedTouch USB Diagnostics] "C:\Programmi\Alcatel\SpeedTouch USB\Dragdiag.exe" /icon
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [AVG7_EMC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
O4 - HKCU\..\Run: [CSRSSU] C:\WINDOWS\System32\CSRSSU.EXE
O4 - HKCU\..\Run: [CTFMON32] C:\WINDOWS\System32\CTFMON32.EXE
O4 - Global Startup: ZoneAlarm.lnk = C:\Programmi\Zone Labs\ZoneAlarm\zonealarm.exe
O4 - Global Startup: EPSON Status Monitor 3 Environment Check 2.lnk = C:\WINDOWS\system32\spool\drivers\w32x86\3\E_SRCV02.EXE
O23 - Service: AVG7 Alert Manager Server - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: EPSON Printer Status Agent2 - SEIKO EPSON CORPORATION - C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
O23 - Service: NVIDIA Display Driver Service - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: TrueVector Internet Monitor - Zone Labs Inc. - C:\WINDOWS\system32\ZONELABS\vsmon.exe
Credo che la dll incriminata sia" sehlp.dll ". Riesco a cancellarla (ho provato anche a spostarla e rinominarla), ma poi riappare subito su c:\windows
Ho anche provato ad avviare sotto dos e cancellarla ma si riproduce.
Attendo qualche suggerimento anche su altri elementi da eliminare dal file di log .
Grazie in anticipo
Roberto
