you know this happened to me a while back
i was cleaning out my computer of all the games and programs i didnt use any more and i came across Pando...i knew it wasnt a microsoft program nor one that i downloaded so i uninstalled it...
a couple weeks later my HShield errored and i had to reinstall CA so i download the installer and got the same error message as you
i reinstalled pando but of no help
so now i have to download the setup file whenever the HSield corrupts https://download2.nexon.net/Game/Comb...tArmsSetup.exe
it takes a little longer but it works =/