from Charlie Owen's Blog

1) Launch Notepad.

2) Copy + Paste the following:

Windows Registry Editor Version 5.00
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Applications\{3C1BB651-D564-46a7-99BA-8D40BCB6FA7D}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Applications\{48095937-BA42-4bb6-9869-EBAC2229D3AF}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Applications\{4F5AC696-6D21-4dac-BC8B-8287245B2A13}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Applications\{866BD81A-F32D-4b44-830A-F5C37585CB9D}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Applications\{A897807C-6278-46bc-B973-9DD1DE8551DF}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Applications\{B4C403DA-6240-4070-80F1-1B1689FF301F}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Applications\{F755EA7F-777E-498f-831D-E3F3F6FDA018}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Categories\Services\Games\{115EADF1-41C4-471b-8FE5-7A52B91BFE75}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Categories\Services\Games\{13FCBFA9-499D-417c-95BB-71DF7980BEB5}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Categories\Services\Games\{1F3BD1B5-7323-4ec0-A518-47FF6B1DDC46}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Categories\Services\Games\{6B51FBA8-28D5-45d4-BEE8-A9715F724D39}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Categories\Services\Games\{76CA43A7-7878-4c7b-BC8B-BE0CAB71ACE8}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Categories\Services\Games\{C99561F0-BEC8-4af4-9926-40BB79D34B07}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Categories\Services\Games\{DD4B1666-AA76-4979-9130-EC9D6F8FE52E}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Entry Points\{115EADF1-41C4-471b-8FE5-7A52B91BFE75}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Entry Points\{13FCBFA9-499D-417c-95BB-71DF7980BEB5}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Entry Points\{1F3BD1B5-7323-4ec0-A518-47FF6B1DDC46}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Entry Points\{6B51FBA8-28D5-45d4-BEE8-A9715F724D39}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Entry Points\{76CA43A7-7878-4c7b-BC8B-BE0CAB71ACE8}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Entry Points\{C99561F0-BEC8-4af4-9926-40BB79D34B07}]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Extensibility\Entry Points\{DD4B1666-AA76-4979-9130-EC9D6F8FE52E}]

3) Save as 'RemoveGamesFromMediaCenterLibrary.reg'. (Make sure you have a .reg extension, otherwise it's a plain text file).

4) Double-click the newly created reg file.

5) Click the Yes button in the Registry Editor warning dialog box.

6) Click the OK button in the Registry Editor success dialog.

 

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