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 :)

It attempts to delete all of your registry roots effectively killing your computer.  This will only cause damage if you run it as an admin or else it won't have the access it needs.