we can’t install Team Foundation System (TFS) on windows 64bit. 64bit will be supported in TFS 2010 so i Google to search for any workaround but first list summarize the following:
For more information about 64-bit versions of Windows Server 2003, visit the Microsoft Web site. Team Foundation Server supports running the Team Foundation data-tier and Microsoft SQL Server 2005 on both 32-bit and 64-bit operating systems. Team Foundation Server requires that the application tier run in a native 32-bit environment. The application tier does not support WOW64 or native modes. The following table shows the components that you can install on specific 64-bit operating systems.
First have look on the following website, it contains useful information about installing TFS
http://msdn.microsoft.com/en-us/library/ms253078(VS.90).aspx
http://pointstoshare.spaces.live.com/blog/cns!AEC42F315B4528B0!3280.entry


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