[Solved] "Setup detected that your application is currently running"; Won't run or install

I'm trying to run the installer for Platinum 2016.12, and I'm getting the message:
 
"Setup has detected that your application is currently running".
 
This is after a cold re-boot!
 
...The reason I'm running the installer in the first place is because SONAR refused to run this morning. It would either hang with no visual evidence of it running (except in the Task Manager) or it would display the small rectangular splash screen and hang at that point.
 
I tried a cold re-boot, same behavior. Uh-oh, I thought. Perhaps I should try a re-install. 
The most frustrating thing is that last night I was working on a project, no problems, made some good progress. Now... no joy.
 
I get the same message if I attempt to re-install 2016.11. 
I get the same message if I run the installer as administrator.
 
Note - I've been running the installers directly, outside of the Command Center, since Jan 2015.
 
I downloaded the latest Command Center and installed it, and it is requesting a reboot. I'll do that and try installing from there. Update to follow.
 
In the meantime, any advice would be gratefully received. Help!
I'm running on Windows 10 64-bit; 8 GB RAM.
 

The initial problem reads like a driver issue. Reinstalling SONAR would not address a bad interface driver.

I doubt it will make a difference but you can try renaming the ini files in your SONAR user directory or hold the CTRL key while opening SONAR (assuming the reinstall did not run the personalization process).

Xiwix, interesting.
 
I'll try disabling my Echo Layla 3G, rebooting, then re-installing SONAR. Maybe there's a hardware failure in the sound card? that happened overnight? that is causing the driver to send garbage to sonar and causing these strange errors.