Ho installato l'antivirus Panda e disinstallato Avira ma non riesco a disinstallarlo completamente sono rimasti alcuni file che mi rallentano il PC .
Come posso disinstallare completamente Avira?
Vi posto un log Di Hijacketis forse vi sarà utile .
Vi ringrazio fin d'ora per la disponibilità

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 15.47.52, on 29/04/2016
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
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\Ati2evxx.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Avira\Antivirus\sched.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Panda Security\Panda Security Protection\PSUAMain.exe
C:\Programmi\Avira\Antivirus\avgnt.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Avira\Antivirus\avguard.exe
C:\Programmi\Bonjour\mDNSResponder.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Panda Security\Panda Security Protection\PSANHost.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Panda Security\Panda Devices Agent\AgentSvc.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Panda Security\Panda Security Protection\PSUAService.exe
C:\Programmi\TomTom HOME 2\TomTomHOMEService.exe
C:\Programmi\Avira\Antivirus\avshadow.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Documents and Settings\GIORGIO\Dati applicazioni\uTorrent\uTorrent.exe
C:\Documents and Settings\GIORGIO\Dati applicazioni\uTorrent\updates\3.4.5_41712\utorrentie.exe
C:\Documents and Settings\GIORGIO\Dati applicazioni\uTorrent\updates\3.4.5_41712\utorrentie.exe
C:\WINDOWS\system32\taskmgr.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Mozilla Firefox\plugin-container.exe
C:\WINDOWS\system32\msiexec.exe
C:\Programmi\Avira\Launcher\Avira.ServiceHost.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\Avira\Launcher\Avira.Systray.exe
C:\Programmi\Avira\Antivirus\update.exe
C:\Programmi\Trend Micro\HiJackThis\HiJackThis.exe
C:\Programmi\Mozilla Firefox\plugin-hang-ui.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
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
O4 - HKLM\..\Run: [PSUAMain] "C:\Programmi\Panda Security\Panda Security Protection\PSUAMain.exe" /LaunchSysTray
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\Avira\Antivirus\avgnt.exe" /min
O4 - HKLM\..\Run: [Avira SystrayStartTrigger] C:\Programmi\Avira\Launcher\Avira.SystrayStartTrigger.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O9 - Extra button: Inserisci blog - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: Inserisci &blog in Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\Microsoft Office\OFFICE11\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
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FILECO~1\Skype\Skype4COM.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: Adobe Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - C:\WINDOWS\system32\Macromed\Flash\FlashPlayerUpdateService.exe
O23 - Service: Avira Mail Protection (AntiVirMailService) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\Antivirus\avmailc.exe
O23 - Service: Avira Scheduler (AntiVirSchedulerService) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\Antivirus\sched.exe
O23 - Service: Avira Real-Time Protection (AntiVirService) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\Antivirus\avguard.exe
O23 - Service: Avira Web Protection (AntiVirWebService) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\Antivirus\AVWEBGRD.EXE
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: Avira Service Host (Avira.ServiceHost) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\Launcher\Avira.ServiceHost.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Programmi\Bonjour\mDNSResponder.exe
O23 - Service: Servizio di 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: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Oracle Corporation - C:\Programmi\Java\jre7\bin\jqs.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Programmi\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: Panda Protection Service (NanoServiceMain) - Panda Security, S.L. - C:\Programmi\Panda Security\Panda Security Protection\PSANHost.exe
O23 - Service: Nero BackItUp Scheduler 3 - Nero AG - C:\Programmi\Nero\Nero8\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Programmi\File comuni\Nero\Lib\NMIndexingService.exe
O23 - Service: Panda Devices Agent (PandaAgent) - Panda Security, S.L. - C:\Programmi\Panda Security\Panda Devices Agent\AgentSvc.exe
O23 - Service: Panda Product Service (PSUAService) - Panda Security, S.L. - C:\Programmi\Panda Security\Panda Security Protection\PSUAService.exe
O23 - Service: Remote Packet Capture Protocol v.0 (experimental) (rpcapd) - Riverbed Technology, Inc. - C:\Programmi\WinPcap\rpcapd.exe
O23 - Service: ServiceLayer - Nokia - C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: Skype Updater (SkypeUpdate) - Skype Technologies - C:\Programmi\Skype\Updater\Updater.exe
O23 - Service: TomTomHOMEService - TomTom - C:\Programmi\TomTom HOME 2\TomTomHOMEService.exe

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End of file - 6880 bytes

Prova con il tool di disinstallazione.

https://www.techsupportall.com/avira-uninstall-tool/

Credo però che prima dovrai installarlo di nuovo.