Originally Posted by Serum

no, that's not the case. If you installed the software as an admin, you should be capable of using it, unless it's using network sources that are restricted to your account, but that's not the case.

Sounds to me like you need to manually install the driver. What does it say in the system manager when it's installed?

Hang on.. i just looked;

Here; C:\Program Files\Castle Creations\Castle Link

Check the driver uninstall folder, and execute the UninstallWindows2000andXP.bat.