I decided to post this as it might help others... I haven't solved it yet but .. who knows.
I have a ASUS Sabertooth mobo, overclocked. Performance-wise it runs fine.. high spec's. I used standard ASUS AI II software to set and check stuff like temps. Also works fine. But that software comes with a memory leak in atkexcomsvc.
I've now de-installed and am going to check other versions + contact ASUS if needed.
I'd be happy to hear of others with similar experience or maybe even a solution/correct version?