JAVA Malicious Code Analysis Request

So, i entered in contact with a probably malicious file, i was able to find the .jar file, and could decompile it with JD GUI, here's the source code i got :

http://pastebin.com/1f453jSE

Does anyone know EXACTLY what is it doing?
It seems to be copying, editing windows registry files, what can be done with them?

Infinite Thanks if someone help :)

I've done this because I can. OP, this is the source of the program, minus JNA, decompiled, deobfuscated, and made slightly more readable.

http://www.4shared.com/zip/NCfgc2RQ/prog-thing-src.html

You can probably tell, it's installing browser addons and shoving itself into the 'run' key in the registry.

Also, I did the same for the browser extensions it bundles.