I installed Windows 7 Ultimate this morning on my Late 09 21.5" iMac. Windows installed just fine, I followed the instructions Apple provided in a PDF, and I downloaded the drivers from here: http://support.apple.com/kb/dl995. However, with Windows installed my Magic Mouse does not work. Currently I am using a Dell USB mouse. Both the Magic Mouse and Magic Trackpad show up in the Bluetooth devices list, which means I must have done something right, and my wireless keyboard that came with my iMac is working just fine. Anyone have any solutions?