Miranda: How can i remove Gadu-Gadu

The quick way is simply to delete the two dlls from the plugins directory.

The "correct" way, which will also persist across upgrades is to go into Options, choose Plugins in the tree on the left, and then untick the ones that you don't want, in this case, gg.dll and irc.dll

Then, restart Miranda, and they'll not be there.

Easy.