I've upgraded to Parallels 4, which seemed to go OK, mostly. However when my XP VM starts up the message "Parallels Tools are outdated." appears in the status bar. If I update Parallels Tools the download proceeds correctly, the installer runs and then validates. Then a dialog is shown "An error occurred while Instaling Parallels Tools. Click OK to restart your virtual machine, and then try to install Parallels Tools again." If I click OK the VM reboots and the process is repeated. If I shut down the VM and restart it without pressing OK, again the installation restarts on start up. Are there any suggestions about how to install Parallels Tools successfully or abort the cycle of attempted installation?