Setting Media Center as the automatic CD or DVD player
When you insert a CD or DVD while Media Center is active, your disc plays automatically after a few seconds. If you are not in Media Center, Windows asks you what you want to do with the disc. To avoid this message, you can select Media Center as the primary program to play CDs or DVDs.
To select Media Center as the primary CD or DVD playing program:
1Close Media Center.
2Insert a CD or DVD into the drive. A message appears asking you what you want Windows to do.
3Select Play Audio CD using Media Center. Or
Select Play DVD Video using Media Center.
4Check the Always do the selected action check box, and then click OK.
138Microsoft Windows XP Media Center Edition 2005 Reference Guide