Vista - Windows Update Messed Up DVD!!!!

Today i was watching a DVD on my laptop using Windows Media Centre and Media Player no problems. I then found that there were 4 windows updates that needed installing.

So i downloaded them, installed and restarted and now DVDs will not play in either program. I get >>

"windows media player cannot play this dvd because
there is a problem with digital copy protection between your dvd drive, decoder, and video card."

The 4 updates i downloaded were >>

Definition Update for Windows Defender - KB915597 (Definition 1.24.5399.0)
Installation date: ‎12/‎01/‎2008 23:07
Installation status: Successful
Update type: Important

Security Update for Windows Vista (KB941644)
Installation date: ‎12/‎01/‎2008 23:07
Installation status: Successful
Update type: Important

Update for Windows Vista (KB943411)
Installation date: ‎12/‎01/‎2008 23:07
Installation status: Successful
Update type: Important

Windows Malicious Software Removal Tool - January 2008 (KB890830)
Installation date: ‎12/‎01/‎2008 23:07
Installation status: Successful
Update type: Important

I've tried finding a way to un-install them but i dont believe you can uninstall "important" updates or from windows defender.

I am using a ATI HD 2600 will fully updated drivers so no problems there. Is there anyway i can get my DVD playback working again???

Thanks

Do you have any DVD software like Power DVD or WinDVD? If so I would try and reinstall that application.
Raj

Hi, yeh i installed Power DVD and that works fine. I just dont get why a windows update would stop DVDs working in media centre and media player.

I have the same video card, and found that when I used an DVI-D to DVI-D cable connected to my LCD monitor, I had the same error trying to play DVD's. I connected the monitor with a VGA connection (with the VGA adapter on the video card side), and the problem was solved. I have VISTA Ultimate x64, and couldn't understand for quite a while why, no matter what else I tried, I got this and other errors trying to play DVD's. Try that, hopefully it will help.