My FS2004 was working okay. I installed a Microsoft Optical Desktop 1000 (wireless keyboard and mouse) I have the latest drivers from microsoft. When I started FS2004 the first menu box was offset to the bottom right of the screen and the whole screen flickered wildly and to shut it down I had to use the task manager. I noticed the CPU usage was 100%. At the same time I had also moved my Saitek pro flight yoke from a usb port at the back of the computer to a usb port at the front. OS is XP Pro SP3. Any body got any ideas?