Looks like you're in luck: your mspaint is screwed and you'll have to get a real paint program
MSpaint is crap. Obviously, its features are very limited, but it's also missing a whole lot of ease-of-use features that come standard in most other paint programs. Get yourself one of them. It doesn't have to be one of the giants like Photoshop - most freeware paint programs are better than mspaint. If I were you, I'd burn mspaint onto a CD, delete it off my hard drive, and then flush the CD down the toilet.