Maplestory Bosses Glitching Out

- Completely re-install maple

:f6:
Maple doesn't require installation.

As for solution, I'm not quite very computer handy, especially hardware-related, but if you're suspecting your VGA card died/burned up or something, first generic suggestion would be graphic card update, yes, second would be clean up the insides of your computer. I know mine has gather a considerate amount of dust and I'm starting to have problem while running 3 Maples, will clean soon.
Use a cotton bud, I suggest avoid using water on the chips except for maybe the liquid specifically made for cleaning up. You can uh.. tear the cotton part a bit so that it spreads out and collect dust more effectively.