The forum

 I've seen quite a few posts about the LoL client crashing, but I've read through them and still can't seem to figure out how to get it fixed. I have downloaded and installed the game, and can get into the home page bit and talk to people there. However, as soon as I try to start a game, the screen goes black, the loading screen does not start up, and I get the "Bug Splat" thing which immediately ends any chances of it loading. Also, I have problems with the sound every now and then, which I heard could be something to do with this. I get this in my logs: 

Followed by lots of stuff on this. 

Any idea how I can get this fixed?

Thanks