Hi had a simular issue.
everything related to windows media player was slow
mfpmp.exe took 35 - 40 MB and a constant of 15 - 20 % CPU.
This Solved my problem:
Removing HD audio driver ( Configuration => Software/Programs)
Reboot
Reinstall original drivers
Problem Solved.
Windows Vista Update gave me a new driver for my audio, so I installed
it. Problem returned! So again remove en reinstall problem solved.
Windows update driver notification for audio removed from list.
Hope this might help.
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Darkcasa
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