You're running Win7, I'll assume:
- Do you have FULL admin rights?
- Did you disable all system defences while installing.
- Check ACLs on folders that are installed to. Some exclude Administrrators and only allow "SYSTEM". Google how to get around this.
- Note, sometimes Win7 and Vista say "Program failed to install" when it actually HAS installed properly. There are a complex number of explanations for this. Try using the SDK and ensure it really didn't install.
- Before a fresh install, make sure it is uninstalled 100%.
- Try installing in safe mode under Admin (You can run the install from cmd.exe.
- Pray that one day Microsoft will allow "sudo apt-get install WinSDK7.1" from the terminal
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