I don't know what your Windows problem is, as I don't use Windows to update my 770/N800 but what I suggest you do is download a Linux LiveCD (try Damn Small Linux - it's a 50MB ISO) and boot Linux from the CD. Or use the Ubuntu Feisty Fawn LiveCD (it's a bit larger though at close to 700MB). Then update your device using the Linux flasher-3.0 utility.