Inconsistent Colors - Illustrator on Windows

My colors are all wrong in illustrator, and illustrator alone. Everything is fine in photoshop, however when i try to select 100% yellow in illustrator i get orange! its insane! and the worst part is that the colors are actually correct, its just how the interface of illustrator works. When I try to screen shot, then place the image in another app, the colors look fine. Not sure what to do, I've been messing with my color settings to see if that makes any difference, but nothing helps at all. It makes it impossible to use the program with color. Again, I don't have this problem with photoshop or acrobat, just illustrator. What is going on?