Sorry should have added the following info earlier.. OS is wind 98. Cpu is 750mhz...The Sims program and one other, whose name I cant remember at the moment, are the only two programs that cause the premature restart. The reset of the software works fine. I previously installed a new hard drive, video card. It has 256 ram...I thought maybe it was a bad SIMS cd so I exchanged it for another with same problem. Loads fine but when you try to run it the computer restarts every time..I thought maybe the cdrom drive was intermitten so I installed a new one with same results. I have ran all sorts of test and cannot find anything wrong...Checkd the EA web site for possible solutions but apparently no one else has encountered this problem...REALLY appreciate your help..