I am assuming my issue is hardware as this happens on windows 10 and 7 But none of my source games will run, Gmod, CSGO, CSS, TF etc none work. Had no issues with other games thus far. I am about to try a fresh install of windows 10 but before I do i thought I would get some input here. I have tried running my system with no overclocks on anything and still the issue remains. Not sure what could be causing just those games not to work. I might try another gpu just incase.
I bloody found the issue.. holy crap. Its Riva Tuner... MSI Afterburner on its own is fine but with RT running as well source games crash on start up.
I remember some games didn't start cause I had fraps running. Maybe running source game in "window" mode might work with Riva.
I was shocked to find this as I have played css before with no issues from RT. Might have been an update over the past year that broke something on my system :\