Re: HL2 re-install
No, you're fine. Just right click the game and select "delete local game content." Then when you try to run the game it will install everything you need. The games you purchased are tied to your account. Not your computer. So if you log off of Steam at your house, you can log into it at a friends house and still be able to play the games that you purchased.
AMD Athlon 64 3200+ Venice Core, MSI K8N Neo-4, 2x 512 Corsair Dual Channel, Nvidia Geforce fx 6600 256MB, 160GB HardDrive
Windows Vista Business Edition
"There are 10 types of people in the world. Those who know binary and those who don't."