Try redownloading microsoft.net framework
Memory =/= Hard hard spaceWhat are your computers specs?Run dxdiag and screenshot System and Display tab if you don't know
did you try to mod the game by chance?
Odds are, you have too many programs or processes running, and they're eating up your memory.Try closing out of some programs or ending some processes that you don't want to be using if you know what they are.
Guys if you think it's his system requirements that is his problem you are sillyI can run Terraria on a netbook