obs is already running

The issue is that while opening the OBS application, it is showing " OBS is already running" and I couldn't able to proceed the app. My friend at some other place is very less computer expertise. He is helping me to stream a particular location through OBS. He is getting the problem on his...

I recently did a system restore for reasons I won't get into, but upon opening OBS I see the blue circle on the mouse, then nothing. If I try opening again it gives that message in the title. 1. If I close the task in the task manager, nothing happens...