I've got a pretty beefy computer but i'm having problems running the game portal.
After installing the game and stream, I let steam update all the games and then reset and start to play.
Once start portal the game opens and then my mouse lags all over and the sound is stuttering. HL2 work fine, but I have the same problem with HL2 E 2 and Team fortress 2, just unbelievable amounts of lag.
I have Bioshock and COD4 both running with no problems at 1900 x 1200 full AA.
Why can't i play these games from the orange box?
q9650 (at stock at the moment)
4 GB 1066 Ram
GTX 8800 sli
I've seen that issue before. It's a steam issue where the validity check or crc reads correct, but the file is still corrupt. The only guaranteed way to deal with it I know is to uninstall, then reinstall, steam and all.
I have the same problem unfortunately; installed TF2 from the orange box, then steam, then update. Stuttering with no end. (And I get 15000 3D Marks, so no problem with the mighty power of my machine).
Also a google search did not turn up any solutions. Ok; I'll go and have a look at those links fron sharft6 now...