Get source code from a .EXE file?

Somehow, my game I was working on messed up. When I went to open the .cpp file in Notepad, only about %10 of it was there. I don't know what happened, but when I went to open it in Turbo C++, it said the file was faulty. I was wondering if there is a program out there that you can get the source code of a .EXE file because I still have that.

Unless you know machine / assembly code, you can never understand what is inside the EXE.
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Engineer223

Damn, this sucks. I guess I could just take what I did from the game and make a better one.