Bit of a long shot here mate, but.....
First check you using the right fuse, then try cleaning all contacts and oiling your window mechanisms and see if the motor spins freely.

Just thinking that if there are any mechanisms getting sticky or seizing the motor will have to try extra hard to move your windows, which will mean it will drag more power from the battery which in turn could cause the fuse to keep blowing. Also make sure on of the window switches isn't stuck on.

Worth a go I reckon.