Ok this is an easy fix. I had exactly the same problem.

1. Go to computer, your main drive, program files, common files, Ahead, DSfilter.

2. Rename "NeroVideoProc.ax" to say "1NeroVideoProc.ax"

3. Rename "NeVideo.ax" to say "1NeVideo.ax"

4. Reboot

5. Problem fixed.

That's it!

It started for me just after I installed Nero. It's not Vista.

This was passed on to me by someone in a forum and now I'm paying it forward.

thanks to previous one & best of luck 2 u