system restarts when i run game ???helpme?

ok hello good folks im assuming this is the right place for this but anyhoo im having some trouble with my comp it restarts when i run one specific game "runescape" but everything else i use internet browsers winamp etc. etc. runs fine ive tried multiple spyware removers and anti virus programs im using windows xp on one of those wal mart special computers emachines and ive also tried system restore but for some reason my system restore will not let me go back to any date at all im not your biggest computer head here so im not really sure what to do now i cant just go buy a new comp so i gotta figure this out somehow but i was talking to a friend and she pointed me in you guys direction and told me that you could help so yea if you all have any ideas on what i should do to fix my st00f id be very very grateful if not thanks for your time anyway have a nice day

 

i always run low detail and i forgot to mention that i did do the read and run thing sorry bout that