OzRob

Hi,
I had the same problem, and had found out the culpret.

I recently install Nero and found out by using windows defender to close all startup programs down, then rebooting to see if that fixed the problem.

Yes after quite a few reboots I found it to be Nero's InCD that caused the conflict, Simply disable it and that I'm sure will fix your problem.
If you dont have nero installed it could be a conflicting program, do as above until you find the offending program.

By the way if you have Nero installed and find it to be your problem, please email nero and ask for a fix, as they wont do anything untill the have several complaints,

Hope that help you Rob