Nexus Beta 1 looks at keys in the Windows registry in order to determine if Visual Studio 2008 SP1 is installed.
The registry keys read by the Nexus Beta 1 installer are:
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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0 where key ApplicationID has the value: REG_SZ “VisualStudio”
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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DevDiv\VS\Servicing\9.0 where key SP has the value: REG_DWORD 0x00000001
If your registry does not have those values in those keys, then unfortunately, Nexus Beta 1 will not install.
text from http://supportcenteronline.com/ics/support/KBAnswer.asp?questionID=70