If Dilbert's suggestion doesn't do it, there are a couple other options. Some (particularly older) video card drivers don't automatically switch to VGA and you have to go into the settings of the video card and tell the card to send a VGA signal or a DVI Signal. I would think that card would have no trouble but I don't know. Poke around the settings and see what you find.
By the way - if you take a look at an LCD monitor, you should see a big difference between the DVI connection and the VGA connection. if not there are some other things wrong (like running the LCD below it's rated resolution) that are making it look not as sharp as it should.
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