It is very important to remove all the components of of the XP Antivirus 2008 and all the malware and trojans that it might have come bundle with (such as zlob.trojan, trojan.vundo and Trojan.Downloader). To effectively remove XP Antivirus 2008, you need to find some files in your system
Manual XP Antivirus 2008 Removal Instructions:
Unregister XP Antivirus 2008 DLL Files:
Click here to know how to do it (http://www.xp-vista.com/other/how-to-unregister-dll-files)
shlwapi.dll
wininet.dll
Stop XP Antivirus 2008 Processes: (Do it from Task Manager (Alt+Ctrl+Delete then Select the process Tab select the
XPAntivirus.exe
XPAntivirusUpdate.exe
xpa.exe
xpa2008.exe
Then End Process.
Find and Delete these XP Antivirus 2008: (make a Search and locate them in your system)
xpa.exe
xpa2008.exe
XPAntivirus.exe
XPAntivirusUpdate.exe
shlwapi.dll
wininet.dll
XP antivirus
XPAntivirus.lnk
Uninstall XPAntivirus.lnk
XPAntivirus on the Web.lnk
XPAntivirus.url
XP Antivirus 2008.lnk
Uninstall XP Antivirus 2008.lnk
Remove XP Antivirus 2008 Registry Values: (Run>Regedit>HKEY_USERS\Software\XP antivirus)
It's a bit time consuming but it'll work fine.