Windows XP guest. I reverted to a snapshot from a few months ago, so when I started the guest Parallels automatically started updating the tools. After it restarts the guest, posts the message: "Parallels Tools are outdated. Wait for automatic upgrade to complete or upgrade manually." and the Parallels Tools Installation Agent runs. It restarts the guest again, displays the same message, and continues in a loop. I can interrupt it if I abort at the start of the installation or defer the restart, but it starts the process again whenever the guest is resumed or rebooted. I tried uninstalling the tools and then letting it install instead upgrading (although it looks the same when running). Any ideas as to how this could be resolved?