Here are the drivers for Vista...
If you have tried once and it did not work look for the program/drivers in Add Remove and remove them.
Unhook the webcam from the machine using "safely remove hardware" from the tray.
DLoad the file above and save it to the desktop.
Shut down and re-boot...when Vista is fully loaded then double click the file above you DLoaded and the installation will start. At some point it will tell you when to plug the cam in...