I'm sure it's not your monitor. Update your video driver via the manufacturers website first of all(more than likely, that's all it will take.) Also make sure you've downloaded the patch ver. 2.05. from www.rsdatabase.com
or any other rs site. If you're going to really get into this game, you'd best get at least a 16mg voodoo, TNT, or other 3D accelerator card. They're getting cheaper all the time. If you have any questions on updating vid drivers, I can help.