I have Windows 8 RTM installed on my Dell XPS 1645. I also have an old Dell USB Optical Mouse which I have been using for as long as I can remember. I tried using this mouse for the first time since installing Windows 8 and found that it doesn't work. The device connects and is listed under devices, but doesn't work. Closer inspection says that there is no driver for Optical USB mouse and searching for one has no yielded any fruit. Plugging the mouse in a Windows 7 machine it works just fine. Any ideas?