Problems with Media Center OS

I built a Media Center PC, I am having trouble with the video card (I think).  When I am viewing the information on the TV (Sony 46" LCD rear projector) in a Windows app it appreas fuzzy.  When I am looking a video from a DVD it looks great.  The video card is a "eVGA 256-P2-N517-AX Geforce 7800GT 256MB GDDR3 PCI Express x16 Video Card".  

Also when I am on the web with this machine & I go from site to site, some sites look great as the data is displayed all the way across the screen, others however is only in like 2/3 of the screen & the text is very small & hard to read.

Any suggestions would be great.

Thanks
BeaucairejAsked:
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CallandorCommented:
You will get the best results if you match the video card resolution with the TV pixel resolution.  If this is a wide screen 16:9 aspect ratio TV, you will need a tool like PowerStrip to construct a custom desktop resolution that matches the TV resolution.
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