I have a similar problem with my USB Crystal Optical Mouse and the mouse is working erratically only and frequently is not recognised by Windows.
I tried the option with the USB key in the registry without any avail.
Are there any other options one could try?
System Information:
MSI Megabook GX700 Notebook
Intel Core2Duo T2300 2.0GHz
DDR2 RAM 2GB
Windows Vista Home Premium
Regards
Pete