There have lots talk about the music library rebuilding bug that has been affecting the Windows 7 version of Windows Media Center and I know for lots of users its really frustrating. The good news is Microsoft have released a fix that cures the problem, here are the details from Microsoft
You frequently experience a music library issue when you access the music library in Windows Media Center or in Windows Media Center Extender
You access a music library in Windows Media Center or in Windows Media Center Extender on a computer that is running Windows 7. However, it takes a long time before the music library becomes available. This issue frequently occurs when you perform one of the following actions:
You shut down the Windows Media Center Extender by pressing the power button. Note In a typical situation, you click Tasks and then click Close to shut down the Windows Media Center Extender.
You shut down the computer unexpectedly. For example, you shut down the computer by pressing the power button while you are using Windows Media Center.
Note It can take several minutes to rebuild the music library, depending on the size of the library.
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Thanks Ian