Driver problems with computer?

When I was using the computer one day,light blue vertical lines started appearing on my computer screen. Now I've never had this problem before. My computer then slept on me, it didn't shut down, the screen turned black, and said going into sleep mode or something along those lines. I had music playing, so when the monitor turned off it was still playing music. I was getting a bit angry because every time I moved the mouse it the screen would attempt to turn on, but it showed lines on a black screen and then it would turn off again. I restarted my computer but it still showed the lines, and before the login screen, it would do the same, it would show blow lines across the screen, then turn off. The computer showed that it was still turned on because of the glowing power button. I figured it was a driver issue, so I went into safe mode and uninstalled the video driver (Nvidia GeForce 7300 LE) and restarted the computer. I was irked by what appeared, because on the startup it still had blue lines, but continued to startup. The Windows screen had blue lines, but this time it went into the login screen. I logged in, and tried to reinstall the driver. It said I had to restart to complete the installation. I restarted, but it then had the same problems with having blue lines then turning off before the login screen. The only screen that was fine was the coding screen with white lettering(idk what they call it) so I was bugged by this issue, so I tried the same thing (Uninstalling the driver in safe mode and logging in to reinstall it) but it was the same issue. Is there any way I can fix this problem? It's really getting on my nerves. I scanned with AVG and said there are no viruses present in my computer, so I'm sure it's the driver. I went to safe mode again, and disabled the driver. Starts up fine, but the Dell start up screen has the blue lines on the screen still. It starts up fine, besides the lines. I log in into my regular account and update the driver and enable it. Guess what? Not only does it do it again, but this time it's full of multicolored lined in different segments like green, red, and blue lines. Can anyone PLEASE help. Post answers if you know what you're saying, because I'm 100% sure it is not a virus.