I uninstalled mcafee 2007 while then installing AVG. Then I shutted down the computer. However, after this it takes ages at the welcome screen and then when it finally loads it stops with the desktop but with no taskbar or sound but control pannel works. I then can't do anything. I've done a virus scan with AVG and spyware scan with adaware but it still does not work. WHat should I do? I have lost my XP installation disk as well do I have any options?