Vista Ultimate 64 does not recognize my DVD Burner

I have two DVD Rw drives, one sony & the other is a samsung (fairly new drive).
Both work fine in all other software programs in Vista, except in Media
Center.
when I try to burn video files, or even music files I receive the message:

CD/DVD RECORDER REQUIRED

Ensure that you have a CD or DVD recorder
installed, and then select Retry or Cancel.

When I click on retry, I get the same message.
How do I get the system (MCE) to recognize my recorders?