I have an old Windows system here with a strange problem. Whenever I plug in my USB WLAN adapter the mouse and keyboard both become unresponsive. The system does not hang because other processes visibly keep running.
The problem does not occur with other USB devices such as memory sticks or external harddrives.
It's also not an issue with the WLAN adapter itself because I've tried two different adapters from different vendors, both show the exact same problem.
They register correctly, show up in the device manager if I keep it open and windows pops up the little balloon saying "No wireless network connected" or something but both mouse and keyboard become completely unresponsive.
EDIT: FWIW the system is a completely clean install of WinXP SP3