I have been fighting what i thought was a memory issue with my old computer, to play l4d2. I have now completely reconstructed my gaming comp, replacing all components trying to figure this crash out... (all old gen ddr3) New MB New RAM New PSU New CPU New GPU New Case (5 fans).... How can i be crashing out loading maps? I suspect some kind of valve memory problem or a buffer problem? If i re-validate the game files it is ok for maybe 1 or 2 campaigns (depends how long they are, so maybe a page file element?) dunno if it matters, but when i hold the mouse over steam it is always turning in circles, as if steam hasnt finished its business. Hope some one has ideas, cause i got about 4 computers worth of gear trying to figure this out. Edit ps, could it have something to do with compatibility issues of OS?