Visual Studio 2015 RC Community will not install, says it is already installed

Question

As the title implies, I am not able to install Visual Studio 2015 RC Community, and I keep getting the following errors. For the record, I am on Windows 8.1 Professional.

Answer 1

I followed the steps from MSDN Forum to uninstall the VS2015 Ultimate and VS2015 Preview by running the command

D:\vs_ultimate.exe /uninstall /force

(replace D with the VS2015 DVD or mounted ISO drive letter)

The forum says for VS2013 but same method will work for uninstalling any edition.