I did see several consecutive error dialogs about missing files but this is all part of a massive script so I didn't get a chance to capture it. I've since reformatted the PC and reinstalled with the VC's installed individually. However, I can do it all again. Will report back with anything I find. @spriditis I'll also try your suggestion. UPDATE: Problem seems to be solved The script installs a number of games, programs and tweaks as well as all the run times. Several programs (Such as GPU Tweak II) have dependencies on some of the Run Times. I was insatlling these programs before running your installer with /ai When I moved the Run Time installer near the start of the script, so all dependencies were already installed everything worked find. Tested twice in both scenarios and it seems somehow the order of things messed things up.