Graphics Glitch- Pixelly Screen

Sup, guys. I'm new here, and this problem is really starting to bother me.
It keeps doing this, on all applications and screens, even games or windows explorer. It's gotten so bad that it spreads out all over the screens. If I'm in paint or photoshop, I can scroll down and back up the image to clear that part of the screen, but the tools remain buggy.
It even effects the desktop.

I'm using Windows 7 Ultimate, though I used to have Vista before I made the switch. I'm broke, and my disc drive doesn't work. All of my graphics cards are up to date, as is Java, and it only started doing this after I switched to Windows 7. I am using a Dell Studio 1737, with a Pentium Dual-Core CPU. When I try to play games, it ruins everything so I can't see what anything says, and the graphics themselves scramble.

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