Does it seem like it takes forever for you to load maps and start up the game and shit like that?
I feel bad 4 u sun
http://www.mediafire.com/?ryl0coxrezv7z1z
Open up that zip and drop that shit in your steamapps folder, exit steam, double-click on defrag, wait while your shit gets fixed, and then feel like a boss.
Don't exit the defragger until it's done making sweet love to your gcf files or you'll fuck up your shit. Run this shit after every update for maximum pro-formance.