random comp restarts :((

[tank_decoy]

ok i would like to know wtf is going on with my comp, very commonly my comp restarts whenever i quit out of CS, i go to console type exit, game does normal shutdown then the normal startup beep of my comp comes.... same when i press esc, done, done, then it says "doing this will quit you out of your current multiplayer game. continue?" i click ok, then same thing, it restarts.... if any1 knows why the hell this happens it would be a big help for me and my friend. plz help me..

[Master.America]

Are you playing the most recent version of Counter-Strike (CS 1.6) or are you playing an older version via WON?

[intel]

"doing this will quit you out of your current multiplayer game. continue?"

hes on 1.5, that msg appears on 1.5 only, it never appeared on 1.6.. and no i have no idea of wtf is with your pc, but my pc had a similar problem, it used to restart at anytime it wants, and i couldn't get it fixed...