The native resolution for youir monitor is 1680 x 1050. Is that what you are using?
Two other resolutions will suit your monitor.. 1440 x 900 and 1280 x 800..
BUT, if you have upgraded an XP computer to Windows 7, there is a reasonable chance that the problem lies with your video card driver. Have you installed a Windows 7 video card driver? If there is not one available from the video fard manufacturer, you should look for a newer video card. Vista drivers may work in principle , but not give you the best results..
Mike Hall MVP - Windows Desktop Experience http://msmvps.com/blogs/mikehall/