Won't start. I have a toshiba Satellite A200 0QHO. When i turn it on, it starts normally, but as

Question

I have a toshiba Satellite A200 0QHO. When i turn it on, it starts normally, but as soon as it gets to the main screen, it comes up with "Downloading updates 3/3 0% , Do not turn of the computer" The updates never load, and the computer commences restarting and updating. I've tried starting the computer normally, and tried to take it back to its last known good configuration, but nothing works.Please Help.