Windows Media Player cannot play this DVD because there is a problem with digital copy protection between your DVD drive, decoder, and video card. Try installing an updated driver for your video card.

Most of us that reply in this Forum are just run of the mill users like you and have nothing to do with Microsoft.  There are some Microsoft support staff that frequent the Forum however.

Did resetting the DRM make any difference?

Can you copy this DVD in your Apple machine and try to play the copy in the Windows 7 machine?  Does the original DVD play on any friends Windows 7 machines?

Do any other  DVD movies, besides the pirate one you mentioned, play on your machine?

As your machine is brand new have you approached the manufacturer for their views on the matter?  Are there any updated Bios available for this machine?

Do you get the same error if you test with another user?

How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

http://support.microsoft.com/default.aspx/kb/929135

Are you running a SP1 version of Windows 7?

This example might or might not work for you with your DVD it uses the built-in Administrator account?  It is just something to try.

"It seems that the "Run as administrator" command only gives you some administrative privileges, and they're not enough to install Java (and OpenOffice, by association). In order to get around this, you need to actually log into the built-in administrator. Open a command prompt with admin rights by clicking start, typing cmd into the search/run box, and hitting CTRL-SHIFT-ENTER. At the prompt, type:

net user administrator /active:yes

Then log out of your regular account and back in as the built-in administrator, where you might be able to install the program. When you're done, log back into your regular account and, for security purposes, disable the built-in administrator account using:

net user administrator /active:no "

Can you make use of a program like this to get any further insight toward the problem.

Process Monitor v2.8

http://technet.microsoft.com/en-au/sysinternals/bb896645.aspx

Well I will post a update. I too ran into this problem. I never was able to solve it. However, windows media center plays the dvds which windows media player cannot. Try using windows media center instead and win the battle, calling the war a tie.

please provide the solution

I got a used DVDs from FYI that had digital copys, although someone used up the codes they had already, however the 'update' to windows media player has stoped playback for me as well.

I left a DVD on the menu for music to fall asleep and it was off when I woke up w/ the same message described above, about:

Windows Media Player cannot play this DVD because there is a problem with digital copy protection between your DVD drive, decoder, and video card. Try installing an updated driver for your video card.

I also had to sign up w/ Microsoft for something even though all I had was an email w/ them, just to post this.

Stop being stingy Microsoft, before we all have broken stuff and apples-