I downloaded the Vista + Win7 "quick munge" fix, and it's worked for me, but now when I downloaded and tryed out FragMe's floating weapon icon fix, I get the same quick munge error when I try to munge my sides. What's wrong?

You have the original problem that would have happened had you not installed the fix. When you did what FragMe!'s tutorial directed you to do, you replaced the (Vista)-fixed munge_side.bat with a munge_side.bat that's fixed to munge .hud files.

You need one that does both - I made a quick edit to the Vista-fixed munge_side.bat here:
http://www.filefront.com/15778811/munge_side.bat

I can't promise that it will work, but give it a shot - that should be both the Vista fix and the .hud munge fix.

Ah, I've finally gotten a chance to try this out. Unfortunately, it didn't work. There's no way to use first one, then the other?