Amnesia - crashes during gameplay

[sMasl33t]

Hey. So, I just bought Amnesia: The dark descent on Steam. I've tried to fix the problem through the "Troubleshooting Guide". But I couldn't find anything that helped me..so, when I have played for a little while, suddenly the game TAB's out, and all I see is a black cursor. Then it's impossible to get the game starting again. I can still here the sound, but nothing happens. Then the only thing I can do is "CTRL + ALT + DELETE", and "End task". Would a re-install really help? Please, tell me if you need my whole "HPL.log" file. "WARNING: particle system 3 in candlestick_floor_9 does not exist anymore!
WARNING: particle system 4 in candlestick_floor_9 does not exist anymore!
WARNING: particle system 0 in candlestick_floor_10 does not exist anymore!
WARNING: particle system 1 in candlestick_floor_10 does not exist anymore!
WARNING: particle system 2 in candlestick_floor_10 does not exist anymore!
WARNING: particle system 3 in candlestick_floor_10 does not exist anymore!
WARNING: particle system 4 in candlestick_floor_10 does not exist anymore!
WARNING: particle system 0 in candlestick_tri_6 does not exist anymore!
WARNING: particle system 1 in candlestick_tri_6 does not exist anymore!
WARNING: particle system 2 in candlestick_tri_6 does not exist anymore!
WARNING: particle system 0 in candlestick02_4 does not exist anymore!" These are just a few of those I see..something's clearly wrong, dno what. Though I'm not good with computers. Help highly appreciated.