Amnesia New Issues:

[yoshis2ndcousin]

I would like to ask for help;
I bought amnesia a couple weeks ago and it worked perfectly, SO IT HAS WORKED BEFORE, from playing custom stories to the main storyline. However, when I went to play today, i got the following message:
EXCEPTION_ACCESS_VIOLATION

I have tried the following:
-Running as Administrator
-Rebooting Labtop

Here's what i wish to know:

1. If there is a way to re-install; i bought the game via steam
2. Other information that may help me

IF any other information is needed, tell me what and how to get it.

Thank you in advance.

~yoshis2ndcousin