WinXP (Media Center Edition) won't read DVDs

I have a LG 4521B Combo Drive and used to work fine until now.

Today I upgraded my Mother Board (I think it has nothing to do with it) and upgraded my windows to WinXP SP2 (Media Center Edition). I can read CDs but not DVDs. Everytime I put a DVD in the led flashes for a while but I can’t see any content in my explorer in the dvd.

Any idea what could be wrong.

For some odd reason only dosn’t read original DVDs, but it can read ripped DVDs.

Maybe a Windows bug.