Vista - Games make vista x64 crash when getting on the main menu

Ok, here is my problem ... it happened with 2 games so far. I lauch the game ... i get past those logo you have at the begginig of a game. Then, the menu load, it's there ... for 1 to 3 seconds... then the screnen pixelize with big squares of the main colors of the menu, then black screen with the sound rebouncing like when a CD freeze. And it stays like that ... i have to reboot my computer.

At first it was with Spore ... ?!? yah ... SPORE ... lol, it's odd because I was able to play World in conflict maxed ... COD4 maxed, and at that time, even Crysis played very well too ... maxed ... see below for what i mean by ''maxed''... but now, Crysis started to do that too ... and i was playin it this morning ... no updates, no instal ... nothing was done during that time ... it started like that ... Spore always did that .. i said myself it was just 1 game, that i already finished ... so i didn't paid attention ... but now at 2 games doing that ... the second being Crysis ... its too much for a Rig that cost me 2000$...

So... is it really that 64 bits OS making all that trouble ???
And is there a solution ... so i dont have to pay another damn 250$ for the 32 bits version ... also considering i would no longer use my 4 gigs of ram and that Vista would slow down to hell ... ???

What i mean by maxed : 1920X1200, no AA(I don't care the difference),All the little tweaks and settings set to the most beautiful way possible. All that keeping at least 30 FPS (At least 25 in Crysis ...)

Operating system:
Vista x64 Ultimate (sp1) and all updates

My setup.

Intel core 2 quad 9550 @ 2.83
4X 1 gig RAM kingston ddr3 @ 1333
1 X Sapphire HD4870 512MB GDDR5
ASUS P5E3-DX WI-FI AP
2X500GB Seagate RAID 0
PSU N-Spire 850W 4XPCI-E
Antec 300 Casing
LG BD-Rom--HD-DVD reader combo

I saw a dude having the same problem ... in THIS forum and no one replied ( they close the thread ?!?) ... would be nice to have some vista pros helping us down there instead of closing our threads... :P

Altheran

Hi dude
Its happening the same here..
I tried latest patches, latest DirectX as well as latest Nvidia Driver...the same
I hope it is not a cooling issue..I cant check the temperature
Any news?
would be very grateful if anyone can help..
Its happening the same with C&C tiberium war--Kane's edition as well