I have an older Dell home computer that becomes a zombie after windows starts up. I have tried starting it in safe mode, and using the 'Last configuration that worked', but nothing helps. The fan is running, the mouse works, but when I do a ctl/alt/delete, I can do everything but bring up task mgr, which is greyed out. When I start the computer, it brings up my home page wall paper, but nothing else appears. The computer just seems to chug away but doesn't go anywhere. Any suggestions?