Hi Mark,
I received this from customer support...please try:
Try to disable Vista UAC setting.
And when you launch PDVD, select "Run as administrator" to solve it.
How to run as administrator?
1. Right click the right mouse button on PowerDVD Icon.
2. Select "Run as administrator"
How to disable Vista UAC.
1. Control Panel\User Acconts and Family Safety\User Accounts\Turn User Account Control on or off
2. Disable "Use user Account Control (UAC) to help protect your computer.
3. Reboot machine