I am on a MacBook with OS X, version 10.5.5. Windows XP was installed by the retailer and I've had no problem. I installed MS Office (student edition) myself a week ago with no problem. Today when I opened Windows (which worked ) however and clicked on the Start menu, this action put lines across my screen. Trying subsequent actions just added more lines and now I can get a fully load, clean desktop and nothing works. Please attached. I feel like I might have clicked on the Start menu a second earlier than it was all finished loading. Any help?! Thanks!