Well, again, there is nothing wrong with your screen at all... in fact, it's a fabulous screen.
In all honesty and to be blunt, the problem is that you've got a fabulous screen on which you're trying to display crappy, junk images (not the content of the images, just the quality of them). No screen in the world is going to make those low-resolution images look better.
If you're going to be lifting images from the internet, then one of your best friends should be
http://images.google.com. When you perform your image search, on the left-hand side of the screen, ensure that you've selected the image filter for image size and click on "Large." This will only produce images that are of a large size -- that doesn't mean they'll be able to scale 600% like you want, but it will ensure that they are large images and may, in fact, look decent on your monitor.
I'm not going to get into copyright and ownership of images -- lifting images from the internet, you have to be careful about the copyrights on the images and whether or not you're allowed to be using them in the context in which you're using them. That's a completely different discussion altogether. Someone owns those pictures, and since you're lifting them from the internet, that person probably isn't you. You may be setting foot into copyright infringement territory, but again, this is something you need to tackle and work out yourself.
As it stands now, though, you're trying to take a postage stamp-size image and scale it up many magnitudes -- 600% or more. Again, nothing in the world will make this look acceptable.