I think I'd run the installer and see if it will "repair" whatever got hosed.
Thing is, I've got CC2014 also installed on this machine. Do you think
it's safe to run the CS6 installer on top of that?
You'll have to log off Adobe with the Adobe ID that's registered for the cloud if you want to keep the perpetual license active (since you already have the cloud, it may not be a big deal for you, but I got really pissed off two weeks ago when reinstalling CS6 converted my master collection license on a machine that will never have the cloud installed), and provide a second ID when you run the installer to get it ask for the serial number. It might also make CS6 6the new default for .indd files, so you might end up re-installing CC as well.
Can you go back with System Restore or Time Machine, or do you have a drive image from earlier?
Sorry for the delay in answering. I don't have any relevant system restore points, or drive images.
What I did was to uninstall CC, uninstall CS6, reinstall CS6 the old fashioned way, and then reinstall CC. However, unfortunately, today C6 crashed again (I do not remember it crashing so much over the past few years as it has in the past month), and once again I lost my prefs. (So now I have copies of the 2 relevant pref files and shortcuts to the relevant folder on my desktop).
Well, short of reinstalling Windows 7 (which is actually quite tempting), I'll have to live with it I guess.