From your comments, I would say that your present service gang sounds like bad news. The problem that you have is so simple to fix that I would have expected the memory vendor to take care of it for you over the phone. Right-click any blank spot on your desktop, Go to Arrange Icons, and remove the check mark next to Auto Arrange. That is all there is to it. This will arrange them neatly according to a hidden grid.
Some people like to have a screen loaded with shortcuts for all their applications and data files.
Others, like myself, like to have an almost deserted desktop with various hidden toolbars. For instance, you may see some small icons right next to the Start button. This area is known as the Launch bar. You can drag shortcuts from the desktop to that area where you can launch them with a single mouse click. In order not to clutter that area, you can drag this bar to the right or top of your screen, where it has more space to stretch.