windows media player burning problems

I have windows media player 10 hear lately when I attempt to burn cds from my playlist. I get a message that says no cd or dvd burner has been detected. I have installed windows media player 11 and rolled back to 10 and uninstalled and reinstalled 10. I get the same message I am able to burn images in my roxio se perfectly. Can someone help me?
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I have same or similar prob with WMP11. Not sure when it first occurred, as I havent tried a burn till today. I have two drives. Tried with both drives and different new discs.

Insert a blank disk and

• Explorer pops up showing disc is recognized.
• WMP switches from 'No Disc' to 'Unknown' over on LHS under Library
• 'Insert a blank CD' (IABCD) stays just above the burn list.

I close the Explorer window just in case. Now I drag some titles over. IABCD is replaced momentarily by 'Calculating...' and then back to IABCD.

I then click on 'Start Burn' The CD tray opens, 'Insert Media' message box appears ...

now I am in a loop.

• If I click on Cancel, WMP just goes back to square one (flashes up Burn Complete, despite tray being open) then goes inactive and waiting for user interaction.
• If instead I push the disc back in, Explorer comes up showing the disc and WMP remains with the Insert Media message box (until I click cancel again, when 'Burn Complete' shows down in bottom bar).

Just to be clear, no burning happens!