my laptop has no issue with HL2 but it was difficult to get Episode2 running. I also have issues with many of the newer games like, M&M Dark Messiah and the Ship. but they are playable, However I never tried the multiplayer, I have not really played much multiplayer since Quake over 10 years ago.
Voxxyn, do you want my guest pass for Counter Strike Source? you can view the requirements on Steam.
Monty
