RapidMiner Studio won't start after update to 6.1 (Problem solved thanks Marco)

Hi
I have installed RapidMiner Studio 6.1 version on Windows 7 but it will not start up and after providing the option to start in safe mode and disable extensions it simply sits on a logo saying checking license

Any advice on why this is occurring and how to install RapidMiner 6.1 correctly (note I have been using RapidMiner 6 Studio previously with no problems)

Regards Michael