Before I start I want to say that I know what the "memory could not be read" error means.
I and playing the latest HL2 using Steam. Whenever I get to a 'checkpoint' where it says loading, it will load, but then as soon as I start moving it will crash with the error. I forgot to record the exact error last time, but if anyone thinks they could help, it aint much fun playing like that.
Thanks in advance.