hello, i'm new here. anyways, my pc won't let me restart. most of the times it won't do anything. just freeze on my desktop after clicking restart. if it does shut down it go to a screen that asks if i want to start up normaly, to previous good date or in different modes. after shutting down for awhile it will start back up, but theres always this problem. i have windows xp. avg says theres no threats and i use spyhunter for spyware.........thank you in advance.