Garrysmod 10 won't run! PLEASE HELP! I AM DESPERATE!! I have been running Gmod for quite a while, when today steam said "Steam has found a problem with your local game files. Game files will now be re-acuired from the Steam servers" I click OK but it just keeps re-appearing. I have already tried re-installing Steam and re-downloaded the GCF from here, but nothing worked! I am using the Un-Dead Patch. Please Help! EDIT: I just tried to run Half-Life 2, and the same thing happens! Please help me ! I am desperate!