I am also having a freezing problem. Approximately every 30-60 seconds, mouse/keyboard lockup for ~2 seconds. It is extremely annoying to say the least. If I take out the wireless cards and run using ethernet I don't have any lockups.
I did upgrade the driver to the current version, it says it is dated 6/5/07 in the device manager, and version is 6.0.3.85
Run the built in Network monitor to see if it is tied to utilization.
I'm not sure what you mean by this? can you elaborate?