XP didn't come with the DVD player.
The big clue missing here is what DVD player it's complaining about. Make and version please?
Bob
After reinstalling Windows XP Home, I get a nag screen repeatedly, with the following message:
"Windows detected a DVD decoder that might be incompatible with your system. Select one of the following options:" I don't need or want to upgrade because my DVD is working fine. But nothing I do prevents the message for coming back.
Any ideas?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic