I'm having some troubles with the visual of my Windows 7. One day I turned my computer on, when everything started to look like Windows 98! My VGA is working, I can play my games as always. I tried to use AVG to find virus, but found nothing. Everything is alright, except for the Windows 98 look, and that my Desktop appears to be complete useless now. If I try to click in a icon, the pointer of the mouse appear as loading, but nothing happens. When I try to right click, it frozen for 5 minutes before the menu appears.

It's not a urgent matter, I can use my computer like this, but it would be really better if I could have my Windows 7 back.