MI4 Asio resolution

Hi everybody
I need help with the configuration of the MI4. Until a few days ago everything worked fine. I could choose between 16bit, 24bit and 32bit Asio resolution. But then it was frozen at 32bit resolution which means that the performance now is close to its limits. I can’t even cange the asio resolution. I re-installed the driver twice. Nothing. Since the device manager doesn’t permit to configure too much, it’s hard to understand what’s the matter with all.
For any suggestions I’ll be thankful.

System: Windows XP, Processor Intel Centrino 32 bit.