Esegui 
da qualche tempo all'avvio di windows mi compare una finestra dal titolo: "userinit.exe, disco non trovato" dove si dice: HD2 device not present, e si chiede di inserire un disco e riprovare.
Se continuo a premere annulla (anche 20 volte) il tutto si risolve e posso lavorare tranquillamnete.
Non ho installato nulla negli ultimi tempi, ne hardware nè software.
Vi posto il log di Hijack per un controllo:
Logfile of HijackThis v1.99.1
Scan saved at 12.49.06, on 11/08/2007
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)
Running processes:
E:\WINDOWS\System32\smss.exe
E:\WINDOWS\system32\winlogon.exe
E:\WINDOWS\system32\services.exe
E:\WINDOWS\system32\lsass.exe
E:\WINDOWS\system32\svchost.exe
E:\WINDOWS\System32\svchost.exe
E:\WINDOWS\system32\spoolsv.exe
E:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
E:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
E:\PROGRA~1\Grisoft\AVG7\avgemc.exe
E:\WINDOWS\System32\nvsvc32.exe
E:\WINDOWS\System32\svchost.exe
E:\PROGRA~1\Grisoft\AVG7\avgfwsrv.exe
E:\WINDOWS\system32\userinit.exe
E:\WINDOWS\explorer.exe
E:\WINDOWS\System32\spoolw.exe
E:\WINDOWS\System32\igfxsvc.exe
E:\Programmi\Roxio\Roxio DVDMax Player\PDVDServ.exe
E:\WINDOWS\System32\rundll32.exe
E:\WINDOWS\System32\RunDll32.exe
E:\PROGRA~1\Grisoft\AVG7\avgcc.exe
E:\WINDOWS\System32\drivers\PhiBtn.exe
E:\WINDOWS\System32\drivers\Tray900.exe
E:\Programmi\QuickTime\qttask.exe
E:\Programmi\Java\jre1.6.0_02\bin\jusched.exe
E:\WINDOWS\System32\ctfmon.exe
E:\Programmi\Messenger\msmsgs.exe
E:\WINDOWS\System32\spoolw.exe
E:\WINDOWS\System32\igfxsvc.exe
C:\Programmi\antivirus\hikjack\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - E:\Programmi\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - E:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - E:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE E:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [RemoteControl] E:\Programmi\Roxio\Roxio DVDMax Player\PDVDServ.exe
O4 - HKLM\..\Run: [AdslTaskBar] rundll32.exe stmctrl.dll,TaskBar
O4 - HKLM\..\Run: [Cmaudio] RunDll32 cmicnfg.cpl,CMICtrlWnd
O4 - HKLM\..\Run: [AVG7_CC] E:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [NvMediaCenter] RunDLL32.exe NvMCTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [PhiBtn] %SystemRoot%\System32\drivers\PhiBtn.exe
O4 - HKLM\..\Run: [Traymin900] %SystemRoot%\System32\drivers\Tray900.exe
O4 - HKLM\..\Run: [QuickTime Task] "E:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] "E:\Programmi\Java\jre1.6.0_02\bin\jusched.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] E:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "E:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [spoolw] E:\WINDOWS\System32\spoolw.exe
O4 - HKCU\..\Run: [igfxsvc] E:\WINDOWS\System32\igfxsvc.exe
O4 - Startup: Adobe Gamma.lnk = E:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Startup: imfe.exe
O4 - Startup: PowerReg Scheduler V3.exe
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - E:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - E:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O10 - Unknown file in Winsock LSP: e:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: e:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: e:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: e:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: e:\windows\system32\avgfwafu.dll
O12 - Plugin for .spop: E:\Programmi\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {917623D1-D8E5-11D2-BE8B-00104B06BDE3} (CamImage Class) - http://www.inforiviera.it/new_webcam/AxisCamControl.ocx
O23 - Service: Adobe LM Service - Adobe Systems - E:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - E:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - E:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - E:\PROGRA~1\Grisoft\AVG7\avgemc.exe
O23 - Service: AVG Firewall (AVGFwSrv) - GRISOFT, s.r.o. - E:\PROGRA~1\Grisoft\AVG7\avgfwsrv.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - E:\WINDOWS\System32\nvsvc32.exe
