Creating an app to mask dead pixels on LCD?

Question

Hopefully this is the right forum for this. I have a glaring red pixel on my nice new monitor that just won't come out. I've tried all the physical and software techniques for getting it out and they have failed. What I would like to do is create a program (using c# Visual Studio Express sp1) that runs from the tray and will display a gray pixel in the location of my LCD's stuck pixel, which should be enough to mask it most of the time. The catch is that it needs to take priority over any other screen and be on top even during games and movies.

Can this be done with c#? I am very new to programming and a more experienced friend said c# may not be the best language to code this in. I've seen quick guides on how to draw a single pixel on screen, but the methods they use don't seem to exist in the lastest .Net 3.5/VS2008 package. I'm just looking for some pointers. Thanks