When I was trying to install OpenVPN, it always tells me "The installation cannot continue as OpenVPN is currently running. Please close all OpenVPN instances and re-run the installer." I also tried to do the same thing on my friends computer, got the same result. I checked the Task Manage, I can see any OpenVPN process in running.
I googled this issue, it looks no one have this problem besides me.
Wish someone could help me with it.