Thanks very much John Noel and Peter for your suggestionss, I really appreciate you all taking the time to help me. By the way I do have UAC turned off. I have tried everything suggested but no good, error messages still there.

To be honest I still have an inkling that its to do with windows 7 32 bit and I think I will just live with the errors and not use the mixer a lot. Thanks Noel for that suggestion about clicking the mixer again in the toolbar to close the mixer as clicking on the X in the mixer wasn't working. At least now biab will open without any errors and I will avoid using the mixer.

Would appreciate it though if anyone else with windows 7 32 bit or PG music could confirm if biab 2011.5 is working ok without error in that OS.

Thanks very much again
axey