scusatemi ma da giorni mi ritrovo col mio pc windows xp senza più nulla sul desktop.potete aiutarmi?
ho scaricato il log se puo' essere utile:

Logfile of HijackThis v1.99.1
Scan saved at 21.49.35, on 02/07/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\system32\wscntfy.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\WINDOWS\regedit.exe
C:\Documents and Settings\user\Impostazioni locali\Temp\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
F2 - REG:system.ini: UserInit=C:\WINDOWS\system32\userinit.exe,userinit.exe
O2 - BHO: (no name) - {13F20E4F-F379-41EA-8F80-CCAAE787362A} - C:\WINDOWS\system32\fccaAron.dll
O2 - BHO: (no name) - {4FB82EB2-A44B-4DAB-9F1B-9B7BA9704262} - C:\WINDOWS\system32\wvUkIYss.dll (file missing)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: {a3c50254-e9a3-5829-2e44-501ebf577a95} - {59a775fb-e105-44e2-9285-3a9e45205c3a} - C:\WINDOWS\system32\dihajurk.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O4 - HKLM\..\Run: [PCSuiteTrayApplication] C:\PROGRA~1\Nokia\NOKIAP~1\LAUNCH~1.EXE -startup
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre1.6.0_02\bin\jusched.exe"
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKLM\..\Run: [Control Center] C:\Programmi\Sagem\WLAN Card Utilities\Center.exe
O4 - HKLM\..\Run: [80192f86] rundll32.exe "C:\WINDOWS\system32\ehdijnbw.dll",b
O4 - HKLM\..\Run: [BM832a1c1a] Rundll32.exe "C:\WINDOWS\system32\bevnxpoc.dll",s
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: WinZip Quick Pick.lnk = C:\Programmi\WinZip\WZQKPICK.EXE
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O9 - Extra button: (no name) - {16930DCA-0910-4C00-86FF-0C73872D4ABA} - javascript:window.location.href="http://www.scaricandomp3.com/link/" (file missing)
O9 - Extra 'Tools' menuitem: Scaricando MP3 - {16930DCA-0910-4C00-86FF-0C73872D4ABA} - javascript:window.location.href="http://www.scaricandomp3.com/link/" (file missing)
O9 - Extra button: Invia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: I&nvia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra button: Create Mobile Favorite - {2EAF5BB1-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MI3AA1~1\INetRepl.dll
O9 - Extra button: (no name) - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MI3AA1~1\INetRepl.dll
O9 - Extra 'Tools' menuitem: Crea preferiti portatile... - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MI3AA1~1\INetRepl.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O15 - Trusted Zone: *.amaena.com (HKLM)
O15 - Trusted Zone: *.avsystemcare.com (HKLM)
O15 - Trusted Zone: *.gomyhit.com (HKLM)
O15 - Trusted Zone: *.imageservr.com (HKLM)
O15 - Trusted Zone: *.imagesrvr.com (HKLM)
O15 - Trusted Zone: *.onerateld.com (HKLM)
O15 - Trusted Zone: *.safetydownload.com (HKLM)
O15 - Trusted Zone: *.storageguardsoft.com (HKLM)
O15 - Trusted Zone: *.trustedantivirus.com (HKLM)
O15 - Trusted Zone: *.virusschlacht.com (HKLM)
O16 - DPF: {A1F2F2CE-06AF-483C-9F12-D3BAA72477D6} (BatchDownloader Class) - http://appdirectory.messenger.msn.com/AppDirectory/P4Apps/PhotoSwap/DigWXMSN.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O16 - DPF: {DF1C8E21-4045-4D67-B528-335F1A4F0DE9} - http://es6-scripts.dlv4.com/binaries/egaccess4/egaccess4_1073_em_XP.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{5FB601A3-513B-4A88-B2EC-DADA3531F481}: NameServer = 85.37.17.39 85.38.28.71
O18 - Filter hijack: text/xml - {807563E5-5146-11D5-A672-00B0D022E945} - C:\PROGRA~1\FILECO~1\MICROS~1\OFFICE12\MSOXMLMF.DLL
O20 - AppInit_DLLs: upfhnwpn.dll
O20 - Winlogon Notify: fccaAron - C:\WINDOWS\SYSTEM32\fccaAron.dll
O23 - Service: ASService - Unknown owner - C:\Programmi\AntiSpyware\SDService.exe (file missing)
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: AVG Anti-Spyware Guard - GRISOFT s.r.o. - C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: NMIndexingService - Unknown owner - C:\Programmi\File comuni\Ahead\Lib\NMIndexingService.exe (file missing)
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\File comuni\PCSuite\Services\ServiceLayer.exe

grazie 1000 ciao a tutti

il primo consiglio che ti posso dare è quello di postare il log nella sezione virus e sicurezza, (qualcosa di anormale "ad occhio nudo" s'intravede)

effettivamente, potrebbe non essere un problema relativo ad un virus..