Board Thread:Game Help/@comment-32641010-20170721074756/@comment-26440657-20170721111106

First and foremost, ''' Make backups of all your saves! ''' (also, your settings files if you want and whatever else you feel like making backups for) Do that before you even try opening the game again.

After you have backups of your saves, preferably also having backups of your backups, You could simply try reinstalling Terraria. I don't see a reason why another game would break your copy of Terraria, the same with cracked games, a game shouldn't affect other games.