Salve, vorrei chiedervi di controllare questo log perché stranamente stamattina, oltre alla lentezza, all'avvio mi si apre la seguente finestra:
C:\Documents and Settings\Administrator\Dati applicazioni\AVG

riporto di seguito il Log creato da HIJACKTHIS:

Logfile of Trend Micro HijackThis v2.0.5
Scan saved at 10.19.50, on 04/02/2014
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
CHROME: 31.0.1650.57

Boot mode: Normal

Running processes:
C:\WINDOWS\System32\smss.exe
C:\PROGRA~1\AVG\AVG2014\avgrsx.exe
C:\Programmi\AVG\AVG2014\avgcsrvx.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\PROGRA~1\ENIGMA~1\SPYHUN~1\SH4SER~1.EXE
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\LSI SoftModem\agrsmsvc.exe
C:\Programmi\AVG\AVG2014\avgui.exe
C:\Programmi\AVG\AVG2014\avgidsagent.exe
C:\Programmi\AVG SafeGuard toolbar\vprot.exe
C:\Programmi\AVG\AVG2014\avgwdsvc.exe
C:\Programmi\Belkin\F5D7051\WLService.exe
C:\Programmi\IVT Corporation\BlueSoleil\BTNtService.exe
C:\Programmi\Belkin\F5D7051\WLanCfgG.exe
C:\WINDOWS\system32\inetsrv\inetinfo.exe
C:\Programmi\Java\jre7\bin\jqs.exe
C:\Programmi\PDF Complete\pdfsvc.exe
C:\Programmi\CyberLink\Shared files\RichVideo.exe
C:\Programmi\IVT Corporation\BlueSoleil\StartSkysolSvc.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\TeamViewer\Version8\TeamViewer_Service.exe
C:\Programmi\File comuni\AVG Secure Search\vToolbarUpdater\17.3.0\ToolbarUpdater.exe
C:\Programmi\AVG\AVG2014\avgnsx.exe
C:\Programmi\AVG\AVG2014\avgemcx.exe
c:\Programmi\Zune\ZuneBusEnum.exe
C:\WINDOWS\system32\fxssvc.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\File comuni\AVG Secure Search\vToolbarUpdater\17.3.0\loggingserver.exe
C:\WINDOWS\system32\mqsvc.exe
C:\WINDOWS\system32\mqtgsvc.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Administrator\Documenti\Downloads\HijackThis.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iehome&locale=IT_IT&c=74&bd=smb&pf=desktop
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\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
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: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre7\bin\ssv.dll
O2 - BHO: AVG SafeGuard toolbar - {95B7759C-8C7F-4BF1-B163-73684A933233} - C:\Programmi\AVG SafeGuard toolbar\17.3.1.91\AVG SafeGuard toolbar_toolbar.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre7\bin\jp2ssv.dll
O3 - Toolbar: AVG SafeGuard toolbar - {95B7759C-8C7F-4BF1-B163-73684A933233} - C:\Programmi\AVG SafeGuard toolbar\17.3.1.91\AVG SafeGuard toolbar_toolbar.dll
O4 - HKLM\..\Run: [SetRefresh] C:\Programmi\Compaq\SetRefresh\SetRefresh.exe
O4 - HKLM\..\Run: [SDMSSplash] "C:\Programmi\HP_SDMS\SDMSSplash\launcher.exe" "launchdir=C:\Programmi\HP_SDMS\SDMSSplash"
O4 - HKLM\..\Run: [Samsung PanelMgr] C:\WINDOWS\Samsung\PanelMgr\SSMMgr.exe /autorun
O4 - HKLM\..\Run: [mobilegeni daemon] C:\Programmi\Mobogenie\DaemonProcess.exe
O4 - HKLM\..\Run: [AVG_UI] "C:\Programmi\AVG\AVG2014\avgui.exe" /TRAYONLY
O4 - HKLM\..\Run: [amd_dc_opt] C:\Programmi\AMD\Dual-Core Optimizer\amd_dc_opt.exe
O4 - HKLM\..\Run: [Adobe ARM] "C:\Programmi\File comuni\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [vProt] "C:\Programmi\AVG SafeGuard toolbar\vprot.exe"
O4 - HKCU\..\Run: [AVG-Secure-Search-Update_0214c] C:\Documents and Settings\Administrator\Dati applicazioni\AVG 0214c Campaign\AVG-Secure-Search-Update-0214c.exe /PROMPT /mid=7a363c94597d919efd9e6e9e4af8039b-315feb7182dfb33a95ae7243884b41d897df9c79 /CMPID=0214c
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O8 - Extra context menu item: &AOL Toolbar Cerca - c:\programmi\aol\aol toolbar 5.0\resources\it-it\local\search.html
O8 - Extra context menu item: Free YouTube Download - C:\Documents and Settings\Administrator\Dati applicazioni\DVDVideoSoftIEHelpers\freeytvdownloader.htm
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O14 - IERESET.INF: START_PAGE_URL=http://www.hp.com
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://www.update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1256138779437
O17 - HKLM\System\CCS\Services\Tcpip\..\{189626C3-9E5F-44F2-B342-DB6F65F496F7}: NameServer = 8.8.8.8,8.8.4.4
O17 - HKLM\System\CCS\Services\Tcpip\..\{A29EEB78-AB41-422B-AE8A-EFE76264EB61}: NameServer = 8.8.8.8,8.8.4.4
O17 - HKLM\System\CCS\Services\Tcpip\..\{CDE5E893-A377-4C50-8532-D2606641ACD8}: NameServer = 8.8.8.8,8.8.4.4
O17 - HKLM\System\CS1\Services\Tcpip\..\{189626C3-9E5F-44F2-B342-DB6F65F496F7}: NameServer = 8.8.8.8,8.8.4.4
O17 - HKLM\System\CS2\Services\Tcpip\..\{189626C3-9E5F-44F2-B342-DB6F65F496F7}: NameServer = 8.8.8.8,8.8.4.4
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - (no file)
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\WINDOWS\system32\Skype4COM.dll
O18 - Protocol: viprotocol - {B658800C-F66E-4EF3-AB85-6C0C227862A9} - C:\Programmi\File comuni\AVG Secure Search\ViProtocolInstaller\17.3.0\ViProtocol.dll
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: Agere Modem Call Progress Audio (AgereModemAudio) - LSI Corporation - C:\Programmi\LSI SoftModem\agrsmsvc.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: AVGIDSAgent - AVG Technologies CZ, s.r.o. - C:\Programmi\AVG\AVG2014\avgidsagent.exe
O23 - Service: AVG WatchDog (avgwd) - AVG Technologies CZ, s.r.o. - C:\Programmi\AVG\AVG2014\avgwdsvc.exe
O23 - Service: Belkin High-Speed Mode Wireless G USB Driver (Belkin High-Speed Mode Wireless G USB Network Adapter Service) - Unknown owner - C:\Programmi\Belkin\F5D7051\WLService.exe
O23 - Service: BlueSoleil Hid Service - Unknown owner - C:\Programmi\IVT Corporation\BlueSoleil\BTNtService.exe
O23 - Service: getPlus(R) Helper - NOS Microsystems Ltd. - C:\Programmi\NOS\bin\getPlus_HelperSvc.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Oracle Corporation - C:\Programmi\Java\jre7\bin\jqs.exe
O23 - Service: PDF Document Manager (pdfcDispatcher) - PDF Complete Inc - C:\Programmi\PDF Complete\pdfsvc.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Programmi\CyberLink\Shared files\RichVideo.exe
O23 - Service: ServiceLayer - Nokia - C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: SpyHunter 4 Service - Enigma Software Group USA, LLC. - C:\PROGRA~1\ENIGMA~1\SPYHUN~1\SH4SER~1.EXE
O23 - Service: Start BT in service - Unknown owner - C:\Programmi\IVT Corporation\BlueSoleil\StartSkysolSvc.exe
O23 - Service: TeamViewer 8 (TeamViewer8) - TeamViewer GmbH - C:\Programmi\TeamViewer\Version8\TeamViewer_Service.exe
O23 - Service: vToolbarUpdater17.3.0 - Unknown owner - C:\Programmi\File comuni\AVG Secure Search\vToolbarUpdater\17.3.0\ToolbarUpdater.exe
O24 - Desktop Component 1: (no name) - http://www.scarioni.it/

--
End of file - 9143 bytes


Vi ringrazio in anticipo per l'aiuto.
Pietro

Quella finestra fa riferimento ad AVG l'antivirus e dovrebbe essere normale.
Facciamo un po' di pulizia, fai queste scansioni:

Scarica ed installa MalwareBytes:
clicca qui per il download : http://www.aiutamici.com/software?id=80346
Clicca su: Link al sito principale, poi nella pagina che appare clicca su: Free Version Download.
Prima di fare la scansione AGGIORNALO. (è molto importante)
Esegui una scansione COMPLETA del sistema. (NON veloce)
Elimina gli eventuali file infetti trovati. (li devi selezionare, e poi cliccare su "Rimuovi selezionati")
Posta il log.

Scarica Adwcleaner sul desktop:
http://general-changelog-team.fr/fr/downloads/finish/20-outils-de-xplode/2-adwcleaner
Chiudi tutti i browser (è importante IE,Firefox Chrome ecc...)
Clicca sul pulsante "Scan".
Finita la scansione clicca su "Clean"
Conferma con OK le varie finestre che ti compariranno.
Il pc si riavvierà, e uscirà il log con le eliminazioni.
Postalo qui.

Scarica JunkerRemovalTool da qui: http://thisisudax.org/downloads/JRT.exe
Una volta scaricato chiudere tutti i programmi e il browser, per evitare conflitti disattiva momentaneamente anche l’antivirus, lancialo cliccando sull’eseguibile.
Per Vista win 7 e win 8 clic col destro sull’eseguibile ed Eseguire come Amministratore.
Appare il prompt dei comandi, premere un tasto per continuare e il programma inizia la scansione, può durare diversi minuti, lascia fare senza toccare nulla anche se sembra fermo, alla fine appare il Blocco Note col log, JRT.txt copialo e postalo qui.

Tutte le scansioni vanno fatte in modalità NORMALE.

Alla fine rifai la scansiopne con HJT e posta il nuovo log aggiornato.
Ciao