So, I've been trying to find out why this is, but I can't. The problem I'm having is when I get to this menu and hit install...

I get this error:

So, I go to change the options and everything is greyed out to where I can't change the options.

I'm currently trying to install on W7 (on a virtual machine because I'm on a Mac)

I've tried deleting/retrying the install.

I don't know what else to do.

Any help would be appreciated.