I'm playing the steam version

steam version

edit:
I think i found the memory leak problem , it isnt a memory leak
its a setting on 64 bits windows, if thats changed a time then the problems start to happen.
it has to do with Data Execution Prevention (DEP) and Physical Address Extension (PAE)
IF you are having the "memory problem"
chances are PAE is not forceenabled
To set dep off and pae on use these commands in a "command window"

bcdedit /set nx AlwaysOff
bcdedit /set pae ForceEnable

But first do a check about how your settings are by typing

bcdedit

and look if this 2 lines show
nx AlwaysOff
pae ForceEnable

In my case the memory use stays now at 1.0 / 1.2 gig

Test these commands out to see if it helps with the crashing of the game.

The info about the how to i got from this site

msdn.microsoft.com/en-us/library/windows/hardware/ff542275%28v=vs.85%29.aspx

link

Link

[Edited by jackbig, 7/29/2012 10:12:33 AM]


BTW: i am using windows 7 ultimate 64 bits

[Edited by jackbig, 7/29/2012 10:14:56 AM]

Well game is still crashing over time , so this "fix" didnt work either

Some other user on steam forums suggested a memory clean program.

Which i am going to test

For the ones that want to test also, this is the link

Link

[Edited by jackbig, 7/29/2012 1:24:27 PM]

i got the lags fixed by reducing the game resolution,try it too

gonna disable now V-Sync as Keavaan said and see if it stops the crashing