How do I install FC 3 without loosing my FC 4 installation?
 

I haev FC4 installed on my PC and I have been advised to install FC3 because I want to install Planet CCRMA.

Is there any way of keeping all of my settings in FC4 and install FC3 over it.

Another alternaitve might be to put FC3 on another partition on the same HDD.

What is the diffrerence between FC3 and FC4?

Many thanks for your help.

First I would have tried it on RC4. Then have a look at asroot. You could also look at xen or some other software to make virtual machines. But to instal RC3 in a own root is what i would use.