I have come accross an major annoying problem, anydvd and all my transcoding software crashed, dvd burner locked up, couldn't eject dvd disc etc.
Checked for virus, all is clean, checked installation all good, checked busmaster etc all clear.
The final issue was spyware, that interrupted a lot of my processes, this I removed with ad-aware etc. no more problems since then.
An tip for anyone else, hope to have helped you too.