BF2 locking up PC after joining game

I don't remember the fix, I found it once and can never find it again. When I load BF2, join a server and the map loads, I can play it for like 30 seconds to a minute and whaam! My entire PC locks up completely.

I have all the latest windows updates. Latest ATI drivers. PB is updated. Happens with PR and BF2. PR is the latest version.

My specs are:

AMD Phenom II X4 965 at 3.4Ghz
6GB of dual channel ram at 1600Hz
Crossfire X enabled on 2 ATI 5770's
ATI Drivers version 10.11(Even used 10.9 and 10.10, same thing happens)
Nothing is overclocked, all set to auto
2 320 GB HDD set to Raid 0
Windows 7
AMD Fusion set to Gaming mode
Processor Temp never goes above 52 or 53 degrees Celcius, mostly stays well below 50
I have NO problems with BC2, BOD Black Ops and Call of Duty 4 and Grand Theft Auto IV.
GTA4 is maxed out on the settings.

And I know BF2 works on High Settings, But because I deleted the game and reinstalled it, I have this problem back now. Any ideas? Thanks in advance!

I remember having the same problem some time ago...

I used vista 64 at that time, and after checking really all known fixes the freeze appeared on and on.
Sometimes right after the map begun, sometimes i was able to play for about an hour,
but then suddenly it completely froze my pc, only a hard reset helped out.
I moved back to XP and it worked...so for me it was the OS that caused the problem.

Now im at win7 64, no problems here,too.