Your a bit late playing it now, when it came out months ago.
Its amazing all the same though. One of the best games.
Love GLaDoS, companion cube, cake, pie, portal, whatever. All great.
Probably anything for the Sega Genesis, PS1, or PC.
Firsts;
Jurassic Park Lost World - PS1
Zombies Ate My Neighbors - Sega Genesis
Alone in the Dark (original) - PC
Dig Dug - Arcade
FF1 - NES
Many more.
Check your firewalls, and blocking settings ect.
Check the steam forums for specific, small problems like that though.
You'd be surprised, your bound to find a solution there, in the forum. Post that problem and you'll get loads of hits.
She's like hard vodka. Is fine at first, but get's old and nasty quick, but is good if you're drunk enough.
Please see the sarcasm in that.
What a old rose though. Atleast she won't quit, doing what she loves. People obviously respect her.