I’d been racking my head for a couple of days over why my screen saver won’t kick in on my new PC running Microsoft Vista Ultimate.

After trying several modifications to my screen saver properties, I stumbled upon a Windows Update that was listed under the “Windows Ultimate Extras”. It’s listed as Microsoft – Other Hardware – HID Non-User Input Data Filter. After installing that update (no reboot required), the screen saver worked fine.

Check the KB article here.