[Solved]
After hours of exploiting the corruption of software i finally decided to take a drastic measure and format my PC with a freshly installed Win 7 64 bit. When i was finished prepping my system for use i installed AA assist in the same way as before and tested it, the problem was fix, i can play for hours now

.
Although i regret not finding the exact problem so i could report it here, it probably is something rare and certainly not common. What i can do is give u a list of things i tested that did not effect the impact of the games behavior:
- Reset AA game files
- Reinstalled AA 2.5
- Ran as administrator
- Ran in compatibility mode (XP Sp 2 & 3, No visual effects)
- Ran without firewall or antivirus
- depatch Graphic drivers to a version that was verified to work with AA 2.5
- Reinstalled Visual C++ versions
- DX9c upgrades (also degrades)
I still can't get my head around it but something was corrupted.
Anywayz, thanx for all your input on the matter and hope to see u in game sometime.
Bert