Code 43 Error + Red squiggly horizontal lines on my screen. Red vertical lines on "Starting Windows" screen
I installed a new hard drive on my computer several months ago and have had no problems with it. I also installed Windows 7 at the same time. Again, no problems until today.
When I booted up my computer, there were numerous bold vertical red lines on the "Starting Windows" screen. Then, when my desktop appeared, there were fine wavy/squiggly horizontal red lines all across the screen. Plus, the font and icon size were really large all of a sudden. I was able to change the font size and icon size back to normal. Nothing seems different about how my computer performs, but the desktop has these weird squiggly red lines, and some of the pictures when I browse the web have the same lines.
What is causing these red lines all of a sudden? I did notice that I get an "Code 43" error message (Windows has stopped this device because it has reported problems...) concerning my NVIDIA GeForce 9800GT when I looked it up in Device Manager. So I tried to download the most current driver from NVIDIA (for Win 7 64-bit). It didn't help and my computer still will not recognize/use this device. I tried re-booting numerous times. What does one do in this situation?
The only thing I did differently today than any other day is watch a short video online from a secure website. That's it! Please help...thx!