Multiple Ruby versions in Windows

Multiple ruby versions in windows can possible with "http://github.com/vertiginous/pik">Pik

Install gem gem install pik;

After the gem is installed, you can use the ‘pik_install’ script to install the pik executable. Install pik to a location that’s in your path, but someplace other than your ruby\bin dir.

Path
For instance, the directory C:\Pik is in my path:

Set the path in 'Environment variables' like
>path PATH=C:\Pik;C:\Program Files\Windows Resource Kits\Tools\;c:\ruby\Ruby-186-p383\bin;