Installed Catalyst 7.4 and SageTV 6.19.. now DVD's won't play

[korben_dallas]

Uninstalled Catalyst 7.2
Reboot
Installed Catalyst 7.4
Reboot
Installed SageTV 6.19
Reboot

Played around w/ SageTV a bit this afternoon, all seems ok. Then tonight I popped in a DVD. Windows Media Player (11) popped up as normal, but gives me this error message:
"Windows Media Player cannot play this DVD because a problem occurred with digital copyright protection" (C00D1163)

I uninstalled the DVD drive in Device Manager
Reboot
Reinstalled Nvidia Purevideo, entered key etc.
Reboot

Still same error message. Tried multiple DVD's, all with the same problem.

I checked the Video checkup utility, but Nvidia is still listed as the preferred codec.

Any ideas?

[bcjenkins]

If you are using this with component out and displaying above 480p you'll get that message.

B