I'm new to Studio 4.5 and I'm having a problem.......

I've bought add on content and downloaded freebies and followed the read me's which basically said to extract the files to "My Library" but now I have a right mess of folders and can't find anything!

I was thinking of completely reinstalling Studio and starting again but before I do can anyone point me to a good tutorial on manually installing the files to the correct folders? (i.e. drag & drop)  I've Googled it and read quite a few tutorials but they have either been for previous versions or just say extract to "My Library" which clearly doesn't work!!

Any help greatly appreciated.