vorpX doesn’t do anything unless you start it, it’s just a normal program. There aren’t any backround processes or similar things that get activated automatically. It 100% can’t have any influence on Arma 3 starting or not unless you start vorpX. Even if it crashes with vorpX and then doesn’t start again after using vorpX, a reboot will definitely help. No need to uninstall vorpX.
Apart from that Arma 3 is used regularly by quite a few users for years. Just be aware that it won’t work with BattleEye enabled. Unfortunately the BattleEye programmer some time ago made his program incompatible with vorpX.