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Windows 7 has some fine in-built diagnostic tools to help you trouble-shoot Windows Media Player issues, which you may be facing.
To open these specific troubleshooting & diagnostic modules do the following:

Type msdt.exe -id WindowsMediaPlayerConfigurationDiagnostic in Start Search and hit Enter to open the troubleshooting wizard which will help you reset WMP to default settings.

Type msdt.exe -id WindowsMediaPlayerLibraryDiagnostic in Start Search and hit Enter to open the troubleshooting wizard which will help make Media files show up in WMP library.

Type msdt.exe -id WindowsMediaPlayerDVDDiagnostic in Start Search and hit Enter to open the troubleshooting wizard which will help trouble-shoot DVD playing problems.
You could also use the Fix WMP Utility which re-registers all concerned dll’s required for the smooth functioning of Windows Media Player. I have attached here
View attachment 43730
Hope this helps
Source: http://www.thewindowsclub.com/troubleshooting-windows-media-player-in-windows-7
To open these specific troubleshooting & diagnostic modules do the following:

Type msdt.exe -id WindowsMediaPlayerConfigurationDiagnostic in Start Search and hit Enter to open the troubleshooting wizard which will help you reset WMP to default settings.

Type msdt.exe -id WindowsMediaPlayerLibraryDiagnostic in Start Search and hit Enter to open the troubleshooting wizard which will help make Media files show up in WMP library.

Type msdt.exe -id WindowsMediaPlayerDVDDiagnostic in Start Search and hit Enter to open the troubleshooting wizard which will help trouble-shoot DVD playing problems.
You could also use the Fix WMP Utility which re-registers all concerned dll’s required for the smooth functioning of Windows Media Player. I have attached here
View attachment 43730
Hope this helps
Source: http://www.thewindowsclub.com/troubleshooting-windows-media-player-in-windows-7
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Windows 7 Ultimate - 64-bit | Windows 8 Pro -...Intel® Core™ i7 Processor 3,610QM (2.30Hz, 6M...8 GBNVIDIA® GeForce® GT 650M 2GB Graphics, Optimu...
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