I can't install Flash Player on my Macbook Pro OS X Mountain Lion, because of error it keep showing me, that my Dashboard Client is running and i need to close it.
End it using Activity Monitor.
Unfortunately, it won't let me quit any dashboard processes.
I don't know what "won't let me" means. There is a lengthy discussion on closing the Dashboard Client widget on the Apple forum https://discussions.apple.com/thread/1850533
Thank you so much. I feel relieved, and awkward at the same time, of not thinking that i could try doing it on my own
You're welcome. And I'm sorry I couldn't be of more direct help; I do not know Mac OS at all - I solely rely on Google searches here.