youve been conned, you get these popups when u install a certain video codec that comes bundeled with a trojand, thus producing these popups.
here is what you should do.
Manual XP Antivirus 2008 Removal Instructions:
Unregister XP Antivirus 2008 DLL Files:
shlwapi.dll
wininet.dll
Stop XP Antivirus 2008 Processes:
XPAntivirus.exe
XPAntivirusUpdate.exe
xpa.exe
xpa2008.exe
Find and Delete these XP Antivirus 2008:
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:
HKEY_USERS\Software\XP antivirus
Download SpyHunter* Spyware Detection Utility
the website is linked below read it if you want, also when you have done all this download a free anti-virus i suggest AVG and also download advanced windows care personal and run it to fix computer errors and security features