Windows 7 now XP Media player problem

  Quiet Life 17:27 12 May 09
Locked

I installed Windows 7 on a separate partition and now find that in XP (other operating system) Media Player Classic will not play "Failed to query the needed iterface"
Windows Media Player comes up with :"Windows Media Player cannot play the file. This can occur when another program or operating system component encounters a problem but does not communicate the nature of the problem to the Player."
Irfan still continues to play media files.

In addition my Labtec Pro webcam does not work in any applicationn with message "Webcam in use by other application"

All the above work OK in Windows 7

Help appreciated.

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