Encrypted RunAs is a small utility that is designed to make the job of Administrators a little easier, it can be used to run applications or software installations with access rights a standard user does not have.
When you work with computers you will soon come across software that will not work with limited user rights. Normally you would have to either add the user to the administrators or Power User group or find why the software requires administrative rights in the first place, this could be due to many reasons ie, trying to access the local machine registry, registering a DLL or OCX control etc etc.
With Encrypted RunAs installed, a shortcut to an application can be created that uses an account on the local machine that has administrator rights. Therefore only giving rights that are required for the application to run correctly and not the whole machine.