Try a usb or ps/2 mouse and see.

"Roy Sallis" <RoySallis@discussions.microsoft.com> wrote in message
news:74A2F53C-00BB-4ABC-892E-A0430783B57F@microsoft.com...
> Just got a new PC with Vista and my screensaver does not work. A previous
> thread indicated that it could be caused by a wireless mouse. I have a MS
> Intellipoint 4.1. Is this the cause of the problem?