Process: wdfmgr.exe

Process Image: C:\WINDOWS\system32\wdfmgr.exe

Name: "Windows User Mode Driver Manager"
     Microsoft Corporation

Parent: services.exe

Service: UMWDf

Service User-Friendly Name: "Windows User Mode Driver Manager"

Recommendation: Go to services.msc and change it from Automatic to Disabled.

More Info:
"The Windows User Mode Driver Framework service (Wdfmgr.exe) appears in Windows Task Manager after you install Windows Media Player 10"

http://support.microsoft.com/kb/892552

from Microsoft:"" If you do not have a hardware player, you can set the Windows User Mode Driver Framework service Startup type setting either to Disabled or to Manual. Later, if you obtain a hardware player and if you want to synchronize it with Windows Media Player 10, you can enable the Windows User Mode Driver Framework service by changing the Startup type setting back to Automatic. ""

keyword: kb892552

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APPLIES TO = Microsoft Windows Media Player 10
OBSERVED ON = Windows XP , SP2