Windows Media Player Weirdness...

Hi!
I keep getting error messages when I try to use Windows Media Player to play DVDs.
The error message basically says that the Windows Media Player is currently unable to play DVDs. Nothing beyond that…

I’ve recently re-installed Xp professional. That could be the reason because I had no problems playing DVDs on my computer before.

What can I do to make it work again?
Is my PC missing some drivers or else?

I’m no expert on PCs since I mainly use Macs…
I have to get this one working though.

-ED-

Have you downloaded Media Player 10.0 or are you using an earlier version?

Oops, I don't even know. I remember setting the prefs for Windows Media Player so it downloads updates automatically, but I'll check anyway.

Thanks.

-ED-