I need some help with Antivirus XP 2008... Possibly removed all but many steps couldn't be done...?

I read alllll about it online. And read alll about manually removing it. The Problem... dun dun dunnn.... The files it tells me to delete do not exist... well atleast where the people are saying they should be. One site I went to first was a href="http://www.xp-vista.com/spyware-removal/xp-antivirus-2008-removal-instructions-xp-antivirus-2008" rel="nofollow"http://www.xp-vista.com/spyware-removal/…/a and so you can follow along with me there. The first one to unregister... I followed the steps but it couldn't be done. Second one I followed the steps and again couldn't be done. Third couldn't be done. 4th couldnt be done. These all couldnt be done because files were not there/item was there for me to check/uncheck. I know I have the virus still because I just go the ability to change my background... The name of the file used by the virus, I searched it and it brought up files for like the screen saver (blue page that pops up when you first get it) and other stuff having to do with the virus. And I can't delete some of the files. [will edit and cont.]