Ho un portatile toshiba satellite m40-281, windows xp professional, 2GB di ram e 100 GB di hard disk di cui solo 6gb libere.
ecco il log:
Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 23.08.50, on 04/01/2012
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.20935)
Boot mode: Normal

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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Avira\AntiVir Desktop\sched.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Avira\AntiVir Desktop\avguard.exe
C:\Programmi\Application Updater\ApplicationUpdater.exe
C:\Programmi\Avira\AntiVir Desktop\avshadow.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Malwarebytes' Anti-Malware\mbamservice.exe
C:\Programmi\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\Programmi\Avira\AntiVir Desktop\avgnt.exe
C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Toshiba\Bluetooth Toshiba Stack\TosBtSrv.exe
C:\Programmi\TOSHIBA\TOSHIBA Controls\TFncKy.exe
C:\Programmi\Analog Devices\SoundMAX\SMax4PNP.exe
C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
C:\Programmi\File comuni\Spigot\Search Settings\SearchSettings.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\resources\VistaStyle\LClock\lclock.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Documents and Settings\Administrator\Documenti\Download\AUP_Hijack\PortableApps\HiJackThis\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://go.microsoft.com/fwlink/?LinkId=74005
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: pdfforge Toolbar - {B922D405-6D13-4A2B-AE89-08A030DA4402} - C:\Programmi\pdfforge Toolbar\IE\4.9\pdfforgeToolbarIE.dll
O2 - BHO: HP Print Enhancer - {0347C33E-8762-4905-BF09-768834316C61} - C:\Programmi\HP\Digital Imaging\Smart Web Printing\hpswp_printenhancer.dll
O2 - BHO: pdfforge Toolbar - {B922D405-6D13-4A2B-AE89-08A030DA4402} - C:\Programmi\pdfforge Toolbar\IE\4.9\pdfforgeToolbarIE.dll
O2 - BHO: HP Smart BHO Class - {FFFFFFFF-CF4E-4F2B-BDC2-0E72E116A856} - C:\Programmi\HP\Digital Imaging\Smart Web Printing\hpswp_BHO.dll
O3 - Toolbar: pdfforge Toolbar - {B922D405-6D13-4A2B-AE89-08A030DA4402} - C:\Programmi\pdfforge Toolbar\IE\4.9\pdfforgeToolbarIE.dll
O4 - HKLM\..\Run: [ATIPTA] C:\Programmi\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [ITSecMng] %ProgramFiles%\TOSHIBA\Bluetooth Toshiba Stack\ItSecMng.exe /START
O4 - HKLM\..\Run: [TFncKy] TFncKy.exe
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Programmi\Analog Devices\SoundMAX\SMax4PNP.exe
O4 - HKLM\..\Run: [SoundMAX] "C:\Programmi\Analog Devices\SoundMAX\Smax4.exe" /tray
O4 - HKLM\..\Run: [HP Software Update] C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [SearchSettings] "C:\Programmi\File comuni\Spigot\Search Settings\SearchSettings.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [LClock] C:\WINDOWS\resources\VistaStyle\LClock\lclock.exe
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\Run: [LClock] C:\WINDOWS\resources\VistaStyle\LClock\LClock.exe (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\RunOnce: [_nltide_2] regsvr32 /s /n /i:U shell32 (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-20\..\RunOnce: [_nltide_2] regsvr32 /s /n /i:U shell32 (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [_nltide_2] regsvr32 /s /n /i:U shell32 (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [_nltide_2] regsvr32 /s /n /i:U shell32 (User 'Default user')
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~3\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Visualizza o nasconde HP Smart Web Printing - {DDE87865-83C5-48c4-8357-2F5B1AA84522} - C:\Programmi\HP\Digital Imaging\Smart Web Printing\hpswp_BHO.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
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
O17 - HKLM\System\CCS\Services\Tcpip\..\{2B045305-84E2-4AED-9F1C-169C2D80EF04}: NameServer = 85.37.17.50
O17 - HKLM\System\CCS\Services\Tcpip\..\{B66F2CC3-1A7F-48FB-8D37-5C73FFF1E470}: NameServer = 85.37.17.50
O17 - HKLM\System\CS1\Services\Tcpip\..\{2B045305-84E2-4AED-9F1C-169C2D80EF04}: NameServer = 85.37.17.50
O17 - HKLM\System\CS2\Services\Tcpip\..\{2B045305-84E2-4AED-9F1C-169C2D80EF04}: NameServer = 85.37.17.50
O22 - SharedTaskScheduler: Precaricatore Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Daemon di cache delle categorie di componenti - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
O23 - Service: Avira AntiVir Scheduler (AntiVirScheduler) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira AntiVir Guard (AntiVirService) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Application Updater - Spigot, Inc. - C:\Programmi\Application Updater\ApplicationUpdater.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: FLEXnet Licensing Service - Macrovision Europe Ltd. - C:\Programmi\File comuni\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Servizio Google Update (gupdate) (gupdate) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Programmi\Malwarebytes' Anti-Malware\mbamservice.exe
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: TOSHIBA Bluetooth Service - TOSHIBA CORPORATION - C:\Programmi\Toshiba\Bluetooth Toshiba Stack\TosBtSrv.exe

--
End of file - 7690 bytes

Una cosa...è possibile che un virus o nn so cosa abbia riempito la memoria??io sn sicuro di averne più del doppio fino a poco tempo fa e ultimamente nn ho scaricato nulla...cmq grazie

Salve
se ho capito bene non ti tornano i conti
tra cio che hai e cio che dovresti avere.
Cerca le cartelle temp dei prog P2P(emule)
ci sono sempre dei "cadaveri" di file che il prog non sente.
Una volta su un PC ho trovato più di 50 GB.
Si consiglia di finire gli scaricamenti ogni tanto e poi svuotare la cartella temp.
Saluti

Salve
Svuotare
cioè la apri e butti via tutto e
svuoti il cestino.
Saluti

Le cartelle sono queste:
C:\Programmi\Application Updater\ApplicationUpdater.exe
C:\Programmi\File comuni\Spigot\Search Settings\SearchSettings.exe
C:\WINDOWS\resources\VistaStyle\LClock\lclock.exe (occupa spazio inutilmente).
Ora provo con unlocker