It sounds like you updated the driver for your video card, or possibly your monitor. Hopefully you did not download drivers from the MS Windows update site.
So, can you post you system specs: makes and models of video card and monitor, and the motherboard, CPU, RAM, HDDs, CD/DVD drives, and operating system?
If I'm guessing correctly, we can provide links to your video card drivers (if we know your card's make and model). Then you can follow the link(s) to download and install the latest drivers available for your operating system.
edited: Everyone here was once a beginner, so that's a non-issue.