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.
TheDigitalLifeStyle.com the home of The Media Center Show! Microsoft MVP