I don't even know what to call this... help please?

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This is kind of a freeze, kind of a crash, but mostly an annoyance I guess. Does anyone recognize what these screens are telling me?
(http) ://i290.photobucket.com/albums/ll276/Webbstre/710f5117.jpg
(http) ://i290.photobucket.com/albums/ll276/Webbstre/07c03fa9.jpg
(This is my first post, so they wouldn't let me put pictures)

The top image is the entire screen, and the bottom is a close-up of a random part to show the "blocks". Sorry about the quality, but I took them with my cell phone.

The first time this happened to me was over the weekend, when I was "Previewing" some photos with Windows (whatever program it is that opens when you right-click and choose preview in Windows Vista). It happened twice in a row, then stopped. Today it happened while I was playing a game. The first two times I could move my mouse and see some movement on the screen (although scrambled movement), but this time no mouse movement could be seen.

I have Windows Vista Ultimate, and an Nvidia 9800 GTX 512MB graphics card, if that helps. My old graphics card (a GTX 8800) died a month ago, and when I took the computer in to the shop they replaced it with the new card and I started a fresh OS install on a new hard drive, so right now all my drivers are updated.

Anyone know what this could be?
 
Ok, under advice of people here and other places, I updated my drivers, opened the computer, checked all the cords, and unplugged and replugged the graphics card once. If this happens again, I am to assume that the graphics card itself is going bad?
 
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