You need to reinstall the X10 drivers from who else? X10...
Here - Believe it or not, this will work.
Download, Install - Restart.
ftp://ftp.x10.com/pub/applications/d...x10drivers.exe
I've had this same problem with ATI's REMOTE WONDER. Install that driver for the USB RF and you're good to go. Both ATI & NVIDIA use that driver for there remotes.
Good Luck!