Game doesn't start anymore...

[CasT]

So, I preordered AAMFP and I instantly played it when it was released.
At first it played perfectly, no lags, no crashes, nothing.

But, when I wanted to play again the next day, it didn't work anymore...
I solved it by looking at different threads on this forum (by replacing the msvcp100.dll file, the xinpit1_3.dll file, and the msvcr100.dll file).
It worked again (yesterday), it again played perfectly.

And again, I wanted to play again today, but it says again that AAMFP doesn't work anymore.
I looked in the steamapps folder and then amnesia, those three files were gone???

When I start the game from that folder it says that one of those three files are missing, so I replaced that one back.
Then it said that it needs to be reinstalled or something and that files are missing...


So I'm rewally confused, and I really want to play the game again.
Hope for a solution soon.