HP 840b - Problem with DVD reading

Hi! It’s my first post :slight_smile: I hope you could help me.

My problem seems to be quite strange: after a fresh new installation of win xp my HP840b doesn’t read my original dvdgames (Colin mcRae Dirt, NHL 2008) but read without problem a backup copy of another game (Call of Juarez).
My burner is proper installed, and read without problem every cd that I put in.
Actually I don’t have a dvdvideo to try, I’ll looking to get one soon.
I have thought (very unprobably) that was a problem with the alimentation (I have a small barebone with a 8800gt inside) but without the graphic card I have problem, too.

Thanks for ever help you could give me!