In order for you to be able to fully evaluate EPiServer CMS RC2 without having to affect your current system configuration, EPiServer has prepared two Virtual PC/Server Images. These images contain all you need to either try the EPiServer site installation or the developer environment.
http://www.episerver.com/en/EPiServer_Knowledge_Center/Download2/EPiServer-CMS-5---RC-2/EPiServer-CMS---Virtual-PC-Image/