okay so im back after a couple years. this site has been great through out the previous years and i come up with another problem about 4 yrs ago i made my own build desktop. with intel 2.4ghz and 2gb of ram. everything worked out great until about last week. i would go online to check my email and out of no where it would restart on me. so i checked the Task Manager/Performance to see if maybe my CPU usage or Memory was being abused too much. What i found from that was when the CPU would run at about 100% maybe 50% of the grid line that it would restart. so i cleaned up the tower a little bit, opened up the heat sink from the cpu chip and took out all the dust that was there and oh boy was there a lot of it. put it all back together and it ran fine. tried different type of tests on the cpu and it didn't restart so i thought fixed the problem for now. but last night i get a call and my sister tells me she tried to check her email and it did the same thing on her and restarted it self. there wasn't anything installed/downloaded on the computer other than igoogle or google earth. so it got me thinking, can it be the power supply, or the memory? i dont see why the memory would act up all of a sudden. maybe a fresh install of windows would do the trick? any help would be great, sorry i made it kind of long but i didn't want to leave anything out of, in case you guys could help. thank you