I have a problem with my PC. I think it might be some virus but i have done scans and i get no viruses detected. What happens is my computer freezes and the mouse cursor slows down and becomes unusable. Also when the screensaver kicks in i get these problems as welL. If i reboot it fixes it, but i have to do ALT/F4 repeatedly to reboot. I did have the SWEN A trojan on one of my hard disks but i got rid of it. Is it possible i have a bios virus or something.