I am trying to install the QFE from KB2403277.
When I install it I get stuck with a message "Waiting for another install to complete".
I don't have an install in progress.
How can I see what it thinks is the one in progress?
This happens from time to time, I typically see it either when there is a broken install or an update process running. 95% of the time it is a broken installer that hasn't quit.
I would advise launching
Hopefully this should help you!