Installation of the latest update locks up at the "Detection" stage, asking me to shut down a running or suspended VM. It cites the valid name of a virtual machine once created under an old version of Parallels. The problem is that I can't find this VM; it isn't listed in the Parallels list of VM's and Finder doesn't turn up a ".pvm" file for it. It seems to be an unwanted artifact that stops installation of the update, but I can't get to it to remove it. Any suggestions?