Forgot about the trick for using it with Vista......
4. What are the system requirements for the Castle Link to work on a PC? Does it work with Vista?
Castle Link will work on almost any PC running Windows 98 SE through XP. It will not run on Windows 95 or earlier.
Castle Link is not officially supported on Windows Vista at this time, however, some customers have reported getting it to work by using the following method. For those using Windows Vista (32bit only, 64bit will not work), rather than hitting "run" and downloading/running the software, save the install file to your desktop. Right click on the install file that is on the desktop and choose "run as administrator". The Castle Link software should install properly after that.