As the title states, when I plug it into my W7 64bit machine, windows acts like it doesn't exist. I have tried the same Uno on a different machine, with the same USB cable, and it works fine. That machine is running W7 64bit as well. The only difference is one machine is Intel and the other is AMD, and the Intel machine is the one that it doesn't work on.
FWIW, it was working fine on the Intel machine originally. I tried various scripts, with plenty of success and enjoyment, and then it wouldn't upload to the board, and then the IDE crashed, and then shortly after that, my machine blue screened. After restart, it will not detect the Uno at all.
Any help would be appreciated, I have done everything I can think of, reinstalling the IDE, trying different USB ports, having that be the only USB device connected; the list goes on and on.