This is what im trying to do also. Windows is not very good on this tablet, extremely low quality wifi reception (but not on android) making windows very slow online unless your sitting next to the wifii router, I prefer the android OS.
It should be pretty easy to flash android on the whole system if we can get hold of the android firmware zip (not rar) but no one seems to have it. hopefully someone will mod a 5.1 version soon and we will be able to install it.