I installed both portal and portal 2 on my HTPC and portal 2 loaded and ran fine. Smooth as butter at max settings.
portal 1 says that it's launching the game and I see hl2.exe show up for a split second in the task manager but then it goes away and nothing happens...
I loaded up several other source engine games and they all work fine. just portal 1 that for some reason will not launch.
only thing I can think of is to delete the local content so I did that and have it re-downloading hoping that something just didn't install right?
sucks cause I want to make another run through the first game before firing up the 2nd one.