Uninstaller thinks Chrome is running and won't uninstall

I recently quit using Chrome and returned to Firefox. I have had some problems with weird displays and the browser locking up, so I posted for assistance in the Firefox forum. Apparently, I have two versions of Shockwave Flash on my PC (Windows 7), Shockwave Flash 26.0 r0  and Shockwave Flash 15.0 r0. I was instructed to use the Uninstaller to remove both and their associated appdata, but when I try to run the Uninstaller, it won't start because it thinks Chrome is open and that I need to close it. Chrome, needless to say, is NOT running. I have done a Windows update, I have restarted the computer, and I have done a cold boot. However, the Uninstaller still seems to think Chrome is running and does not offer any option to shut Chrome down itself. I know Chrome's not running, nor has the computer noted that it's running either time I've shut it down.

Is removing the conflicting versions via the Control Panel as effective as the Flash Uninstaller? If so, will that also remove the associated appdata files at the same time?

If not, how can I resolve this issue and get the Uninstaller to run? Thank you!