FSX: Says it's already running?

My FSX won't run. Every time I click on the icon, a window pops-up and tells me Flight Simulator is already running. I also have FS9 and 2002 - they aren't running but I still get the message. Any takers?

Delete your logbook and FSX should start.

If you have a lot of hours logged, make a back up of your log book first, then delete it. Try FSX. If that solves the problem there's a log book recovery tool in the utilities category of the download section of this website. It will fix your logbook and recover your hard earned hours. Saved me from losing over 500.