I use a DigitalPersona Fingerprint reader to facilitate logging in to my computer. Ever since I have installed DiaplayFusion my fingerprints are not being recognised on the logon screen. This is not a great problem, but it is annoying. I am using an HP dv7 laptop with Windows 7 Ultimate x64.

Thanks, that solved the problem! I don't know what option did the job, but I disabled every option in the Compatibility screen.