This is most likely a driver issue. I'm connecting to my wireless network using Netgear's Rangemax dual band Wireless-N USB 2.0 adapter. When I boot Windows while the usb device is plugged in, it hangs at the "Starting Windows" screen. When the adapter is unplugged, Windows will boot up normally. I'm interested in hearing if anyone else is having issues on Windows 7 64bit with this adapter and how they've resolved the issue.