Recently i changed my video card from nvidia to ati.

Put simply i now have a problem with either video/audio and windows xp pro.
The problem is sometimes my monitor goes into standby.

I have reason to believe that the file 'nvidia wdm tvaudio crossbar'
The actual error is;
"The nVidia WDM TVAudio Crossbar service failed to start due to the following error:
The system cannot find the file specified."

I have tried the usual solutions like completely delete video files and re-install,
this includes going through the registry, i found and crossbar but regedit will not let me delete even in safe mode the the video drivers un-installed

I already have a solution and that is to re-install windows, however i dont want to do it.

Regards
Adam C