You'll need to install the latest Windows 7 compatible driver for your video card.. If there isn't one available, try the latest Vista driver for the card.
And make sure you set the appropriate default optimium screen resolution for your monitor. It should help.
Hope this helps.
I just recently rebuilt my computer and went from windows xp to windows 7. Before rebuilding my computer my monitor was working fine. I did a complete rebuild of everything (motherboard, ram, harddrive, OS) Only thing i kept was the case.
Currently in my new system the monitor works fine except when I try to view any sort of video. It doesnt matter what program I use the same issue happens. I have an Acer AL1916W. When trying to view video the screen video image starts moving all over the screen even outside the video program window.
My system has a 1TB Western Digital 7200rpm harddrive with SATA, 4gb DDR3 1600 Ram, Geforce 6150SE nforce 430 on board graphics.