It works fine on Win7 both x86 and x64, installed win8 then on launch, it won't start. I check the task manager, launch it, hl.exe appears, gets the status Suspended then disappears. Learned about DEP (Data Execution Prevention), followed steps for turning DEP off for chosen apps then I added the hl launcher on the list. Restarted computer, I launch it from the game directory (hl.exe). It launches. I send it to desktop as a shortcut then change the game parameter to launch my mod. Same story, gets suspended. Learned about turning DEP completely off through a command line. Successfully turned it off. Rebooted, same story. First launch succeeds, changing mod dir, nothing.