When playing online, several maps are "corrupted" and I can't play any games using those levels. What does this mean and how can I fix it because it's stopping me from playing 1 vs 1 matches. --- A sword wields no strength unless the hand that holds it has courage
It means that the required maps in your Warcraft III\Maps folder have been modified, deleted, failed to patch/install correctly, couldn't be found, etc. The easiest solution would be to simply reinstall the game from your CD. --- In the modern world, "common sense" is an oxymoron.