This issue reminds me why I take a system backup image each month. I know I can roll everything back to it's last working state.
That full image recovery option is always there if uninstalling a new version of software doesn't fix the issue I'm having. It also takes care of any conflicts with Windows updates or drivers too. It's a complete snapshot of the entire system drive at the time that it was made.
Another option for use now, if you don't have a recent image from a known working state of your PC,
is to look and see if you have a Windows system restore point that you can roll back to. That should only take all of the Windows system files (and registry) back in time to the state they were in when that restore point was made. Your personal folders don't get messed with.
You may need to re-install any software applications that were installed or updated since the date/time of that restore point. The Windows registry gets rolled back as well. There is a tool in Windows System Restore that allow you to scan for affected programs. Just select the desired restore point, and click on "Scan for affected programs".
The way I would do it is to first uninstall the affected program(s), then run the restore, reboot, and re-install the version of the program that I wanted to run. In the case of Sonar, maybe an earlier version ...
Example: last night I updated a program, that broke another program. Just uninstalling the updated version and rebooting did not fix the problem. I had to fall back to a Windows restore point from 7 hours earlier, followed by a reboot, to get running again. Moral of this story: Windows is a tangled mess