HELP: Parallels Tools Fails to Install after 5.0.9344 Update

I updated to 5.0.9344. Parallels tools refuses to install. Gives cryptic dialog before forcing a restart.

The install process seems to work but slows down when it says "Publishing product information". Then after a few minutes a dialog box appears and says

Does anyone know anything about this?
My virtual machine is useless and I really don't want to have to rebuild this, it would take me hours that I just don't have.