Sorry for waiting so long with posting this, BUT IT'S SETTLED! w00000000t!! 1 4m t3 l33t pc 0wnz0r!
Hehe...see what i did was..
-format c: (once again)
-re-installed XP
-installed modem
-got SP1+ essential updates etc.
-installed mobo drivers (latest from asus)
-installed gfx drivers (latest from the web too)
-flashed BIOS
and for some weird-ass reason everything is working just fine now, not a single bleu screen in two days of Vice City, postal, and other stuff!
I must admit that i'm not SURE i flashed the BIOS last time, but beeuh, it works now. What i did notice is that my cpu is standard cooler than with the last install. Back then it was 43, now it's a good 36-37 (all celcius).A mate of mine already suggested something about bios giving wrong temperature shit and stuff, but that seemed so wack i didn't think of it, but apparently that was the prob. Bha, so easy when i look back, blah.
In the meantime i mailed the guys at the pc store and told them about the cooler; and they told me:
"that's most likely a mistake. Even if it's not, our coolers here (that are the same as yours) can easily handle a 2800, so it might not even be a problem. Or maybe it's just a typo in the receit. Whatever it is; we'll be happy to take a look at it if you feel like it." So they're not being difficult either.
Anyways....i wanna thank everyone that cam up with advice on this frustrating quest; everyone being satis and one or two other ppl lol. Tnx bro.
P.S. is it legally allowed for a game to be as cool as Vice City?