Logfile of HijackThis v1.99.1
Scan saved at 18.32.30, on 27/08/2006
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:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\Programmi\CyberLink\Shared Files\RichVideo.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\ZONELABS\vsmon.exe
C:\WINDOWS\URGMR0K1.EXE
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\URGMR0K1.EXE
C:\WINDOWS\Hcontrol.exe
C:\WINDOWS\System32\sistray.EXE
C:\WINDOWS\System32\khooker.exe
C:\WINDOWS\System32\pctspk.exe
C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
C:\WINDOWS\ATKOSD.exe
C:\Programmi\Trend Micro\PC-cillin 2002\PCCClient.exe
C:\Programmi\Trend Micro\PC-cillin 2002\Pop3trap.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\Trend Micro\PC-cillin 2002\PCCPFW.exe
C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb05.exe
C:\Programmi\Winamp\winampa.exe
C:\Programmi\Nokia\Nokia PC Suite 6\LaunchApplication.exe
C:\Programmi\File comuni\PCSuite\DataLayer\DataLayer.exe
C:\WINDOWS\Samsung\ComSMMgr\ssmmgr.exe
C:\WINDOWS\System32\lich.exe
C:\WINDOWS\System32\sysmon.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Pinnacle\Shared Files\InstantCDDVD\PCLETray.exe
C:\Programmi\Pinnacle\InstantCDDVD\InstantWrite\iwctrl.exe
C:\Programmi\Nokia\Nokia PC Suite 6\PcSync2.exe
C:\WINDOWS\system32\CH_Utility.exe
C:\Programmi\Zone Labs\ZoneAlarm\zonealarm.exe
C:\PROGRA~1\FILECO~1\PCSuite\Services\SERVIC~1.EXE
C:\PROGRA~1\FILECO~1\Nokia\MPAPI\MPAPI3s.exe
C:\Programmi\Trend Micro\PC-cillin 2002\WebTrap.EXE
C:\Programmi\WinRAR\WinRAR.exe
C:\DOCUME~1\Riccardo\IMPOST~1\Temp\Rar$EX00.557\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://arianna.libero.it
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.libero.it
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.fastweb.it/
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Microsoft Internet Explorer
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
F2 - REG:system.ini: UserInit=C:\WINDOWS\system32\userinit.exe,,C:\WINDOWS\URGMR0K1.EXE
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [Hcontrol] C:\WINDOWS\Hcontrol.exe
O4 - HKLM\..\Run: [SiS Tray] C:\WINDOWS\System32\sistray.EXE
O4 - HKLM\..\Run: [SiS KHooker] C:\WINDOWS\System32\khooker.exe
O4 - HKLM\..\Run: [SiSUSBRG] C:\WINDOWS\sisUSBrg.exe
O4 - HKLM\..\Run: [PCTVOICE] pctspk.exe
O4 - HKLM\..\Run: [SynTPLpr] C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [pccguide.exe] "C:\Programmi\Trend Micro\PC-cillin 2002\pccguide.exe"
O4 - HKLM\..\Run: [PCCClient.exe] "C:\Programmi\Trend Micro\PC-cillin 2002\PCCClient.exe"
O4 - HKLM\..\Run: [Pop3trap.exe] "C:\Programmi\Trend Micro\PC-cillin 2002\Pop3trap.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [PinnacleDriverCheck] C:\WINDOWS\System32\PSDrvCheck.exe
O4 - HKLM\..\Run: [Anti-Trojan-Watch] C:\Programmi\Anti-Trojan-55\ATWatch.exe
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb05.exe
O4 - HKLM\..\Run: [WinampAgent] C:\Programmi\Winamp\winampa.exe
O4 - HKLM\..\Run: [PCSuiteTrayApplication] C:\Programmi\Nokia\Nokia PC Suite 6\LaunchApplication.exe -onlytray
O4 - HKLM\..\Run: [DataLayer] C:\Programmi\File comuni\PCSuite\DataLayer\DataLayer.exe
O4 - HKLM\..\Run: [Samsung Common SM] "C:\WINDOWS\Samsung\ComSMMgr\ssmmgr.exe" /autorun
O4 - HKLM\..\Run: [lich] lich.exe
O4 - HKLM\..\Run: [Systems] C:\WINDOWS\System32\sysmon.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [InstantTray] C:\Programmi\Pinnacle\Shared Files\InstantCDDVD\PCLETray.exe
O4 - HKCU\..\Run: [IW_Drop_Icon] C:\Programmi\Pinnacle\InstantCDDVD\InstantWrite\iwctrl.exe /dropdisc
O4 - HKCU\..\Run: [PcSync] C:\Programmi\Nokia\Nokia PC Suite 6\PcSync2.exe /NoDialog
O4 - HKCU\..\Run: [MsnMsgr] "C:\Programmi\MSN Messenger\MsnMsgr.Exe" /background
O4 - Global Startup: Chrontel TV.lnk = C:\WINDOWS\system32\CH_Utility.exe
O4 - Global Startup: ZoneAlarm.lnk = C:\Programmi\Zone Labs\ZoneAlarm\zonealarm.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O14 - IERESET.INF: START_PAGE_URL=http://www.libero.it
O15 - Trusted Zone: www.1987324.com
O16 - DPF: Yahoo! Chess - http://download.games.yahoo.com/games/clients/y/ct2_x.cab
O16 - DPF: Yahoo! Dominoes - http://download.games.yahoo.com/games/clients/y/dot8_x.cab
O16 - DPF: Yahoo! Pool 2 - http://download.games.yahoo.com/games/clients/y/pote_x.cab
O16 - DPF: {33331111-1111-1111-1111-611111193457} - file://c:\ex.cab
O16 - DPF: {33331111-1111-1111-1111-611111193458} - file://c:\ex.cab
O16 - DPF: {33331111-1111-1111-1111-622221193458} - file://c:\ex.cab
O16 - DPF: {64311111-1111-1121-1111-111191113457} - file://c:\eied_s7.cab
O21 - SSODL: SystemCheck2 - {54645654-2225-4455-44A1-9F4543D34546} - C:\WINDOWS\System32\vbsys2.dll
O23 - Service: PC-cillin PersonalFirewall (PCCPFW) - Trend Micro Inc. - C:\Programmi\Trend Micro\PC-cillin 2002\PCCPFW.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Programmi\CyberLink\Shared Files\RichVideo.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs Inc. - C:\WINDOWS\system32\ZONELABS\vsmon.exe

scarica questo e fai una scansione dopo averlo installato
http://www.aiutamici.com/software/descrizione.asp?CodSw=1108

Che connessione usi,prova a vedere se la fetecchia ti ha modificato le impostazioni

Scusa il rimprovero,ma dal tuo log,risulta che hai il so non aggiornato.
Le pach di aggiornamento oltre che occupare spazio su disco,servono anche per correggere le falle del tuo xp.dai retta allo zio,fai un bel windows update;o devo pensare che hai il so taroccato?