I bought Gmod about two weeks ago along with HL2 and have been playing it frequently. Now whenever I try to start Gmod, a message pops up saying: Steam Startup() failed: Steam Startup(0xf,0x0018e584) Failed with error 1: failed to take master pipe connection lock. I removed my Gmod folder from the profile folder and started Gmod to make another Gmod folder in the profile folder but that didn’t work. I have Windows 7 premium 64 bit, intel core 2 duo processor t6600, 4GB ddr3 RAM, 400GB HDD, NVIDIA geforce GT 230m graphics.
I hope this is the info you need to help, this is the first time some thing like this has happened to me so help would be greatly appreciated.