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 :)