Antivir2008 is a malware and its of no use to spend money for useless program. Instead download a software called superantispyware and make a clean install of your system and it should be ok afterwards.

Choose it what is best from below site

Go to
http://fresoftsware,com

Antivirus 2008 presents itself as VistaAntivirus2008 and System Antivirus 2008 as well. All these names hide the same fraud. You should remove this parasite from the system quickly. Use Spyware Doctor or read manual removal instructions found here: http://www.2-spyware.com/remove-antivirus2008.html

Antivirus 2008 is an unwanted fake rogue spyware program, from the authors of Antivirus 2009 . These applications have resembling interface and "features". After stealth installation, Antivirus 2009 will show tonns of fake spyware\adware detection messages and offers to remove reported threats (after you purchase commercial version). But in real Antivirus 2009 is not a spyware cleaner, it's just an imitation of spyware remover. Antivirus 2009 can also slow your computer and cause system errors and crashes. Remove Antivirus 2009 using manual removal instructions (for advanced users) or removal tool.

use manual removal guide
http://darfuns.com/xp-antivirus2008-removal/