Removing Parallels
That information was extremely useful: I had an older version of Parallels that caused kernel panics every time it was launched after I upgraded my OS. Further, all attempts to replace it by a newer version failed, with error messages saying that the installation could not be completed while the virtual machine was still running, and that I needed to launch Parallels to stop the VM. As launching Parallels immediately caused a kernel panic, I was in a Catch-22 situation.
I searched the Parallels knowledge base to no avail and thought about contacting Parallels support, but apparently they charge for customer support and I did not feel inclined to pay them for a problem associated with their software. Using your information, I have now removed the last vestiges of that program from my computer. Thank you
I intend installing Fusion at this point.