Ok, I've Googled this everywhere and getting conflicting information, so can one of you clever lot correct me?

I've grabbed FFXI + all expansions from somewhere...
The thing is, I've managed to install all of it, then had to uninstall POL and install the Vista compatible version (it wouldn't let me install it over the top.)
I'm trying to get on the FerrumXI server, but for the life of me cannot find FFXI or anything like it in the Check Files drop down box, only POL and Tetra.
Please please help, I'm totally stumped. I've tried uninstalling, grabbing different versions and everything. Any real reliable sources if that's the problem?