I tried to install Visual Studio Release Candidate 2010 on one one Windows 7 - 64 – Bit machines. Unfortunately the setup just does not start. If I try to start the same setup (to be sure that hash is correct) from other Win7 64-Bit machine it starts successfully.
Note that my machine which cannot start the setup had previously installed VS 2010 Beta 2. I did my best to uninstall bunch of components in the right order. But, who knows.
To workaround this problem I started the setup.exe in Setup folder and not setup.exe in the root of installation media (ISO, DVD or whatever you have). The setup.exe has been started elevated.
This issue is documented at Microsoft connect site: https://connect.microsoft.com/VisualStudio/feedback/details/533209/visual-studio-2010-rc-setup-does-not-start-on-windows-7-x64
Feb 13 2010, 07:01