Ok i have a dell inspiron 8200 running windows xp and one day everytime i tried to press ctrl + alt + delete it would close the window instantly. I then noticed it did the same thing with the disk defragmenter and device manager. My antivirus wasnt working correctly and i figured it was a virus so i uninstalled the antivirus (norton antivirus 2002) and upon attempting to reinstall it it would close the window everytime i tried to install it again. I don't know what to do and anyhelp would be greatly appreciated.