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wmpui is probably Windows Media Player User Interface. Try this:
1. Open a CMD prompt (Start > All Programs > Accessories > Command Prompt) and type:
regsvr32 %SystemRoot%\system32\wmpui.dll.
2. When you receive DllRegisterServer in <Expanded %SystemRoot%>\system32\wmpui.dll succeeded, press OK.
3. Start Windows Media Player.
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