I am missing most of the game files. Help?

[SweeneyToddIsEpic]

And you went to "Program Files\Steam\steamapps\common\"? It should be labelled as 'amnesia the dark descent'

Yes, I went there. There are all the folders for the games my brotehr purchased, but not for me. I backed up the files, so now there is an amnesia the dark descent folder, but it's just the back-up and none of the files are there.

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Okay, I found it. For some unknown reason, the files are being installed to a folder called 'New Folder' in the 'c' drive, instead of the Steam folder in Program Files