okay for some reason my computer always reboots out of no where. I have a windows xp and its been going on a long time. At first i thoguth it was nutin but it kept on happening. I dont think its ne thing i downloaded but im not sure... does ne one have ne ideas...

You could start off by disabling XPs default 'automatic re-start', then see if you get any error messages instead of it just re-starting without a clue. Turn off auto-restart thus:

Control Panel -- System -- click the 'Advanced' tab.

In the 'Startup and Recovery' section, click 'Settings'.

Remove the tick where it says 'Automatically Restart'