Hi guys/girls,
I am experiencing smth similar, running on win 7 x64 (7950) 13.1 drivers. In my case whenever I start mining ( using guiminer scrypt alpha ) the pc becomes non responsive. The mouse will move like 3fps, it still mines though. Current settings are int 20, worksize 256, TC 21712. Temps are fine - 74C on the GPU, 71 and 73 VRM1 and VRM2. I have tried lowering to int to and its a tiny bit better. Any suggestion and wisdom highly appreciated

System specs:
ASrock 970 Ext4
8GB 1333 Single Channel
Sempron X2
750W Seasonic