alright, so my bro has had quite a bit of trouble w/ his comp. first it just blue screened, then it wouldnt' start back up. so we went in usin the xp disk and tried to repair it. but it wouldn't let us do anything. so we reformatted the hdd and were gonna cut our losses, but it wouldn't even get halfway through the xp installation and it would lock up and freeze. so we tried using different cd bays, a different disk. nothing worked. we ran memtest on the ram through knoppix and it passed all tests, let it run all night. so they bought a new mobo, well we installed xp sp3 on it and it seemed to work alright except when he tried to install some games onto his comp (unreal III, Loki, Guildwars (all legit)) ghost recon was the only game he had that would install correctly. the problem at first was that the install wouldn't have any text on the TOS and then it would give an error 1101, i did a search, updated to the most current version of installshield and it had text but wouldn't halfway through the install and the whole system would lock up. i'm pretty sure its not the hdd b/c they swaped it out for one my dad had laying around, so unless 2 hdds are bad. im guessin cpu, but i ran cpu burn in for a couple hours on it and it didn't come up w/ any errors. my bro is going to let it run all night tho. it also locks up on random installs on drivers and other programs too. does anyone have a clue to what the problem is here and how to fix it? mobo is a GA-MA770-UD3, and the cpu is a AMD x2 6000+, or something like that. thanks!