SymptomsYou have upgraded your Host operating system to Mac OS X Snow Leopard from Mac OS X Tiger. Now you receive 'Operating System Too Old' warning message when you start Parallels Desktop 4.0 virtual machine:
CauseMacFUSE is used by Parallels Desktop. Initially MacFUSE for Mac OS X Tiger was installed on Host. After Host operating system was upgraded to MacOS X Snow Leopard, MacFUSE became incompatible.
ResolutionThere are two possible solutions to resolve this issue:
- Reinstall Parallels Desktop
- Update MacFUSE
To reinstall Parallels Desktop:
1.Make sure you are using the latest build of Parallels Desktop 4.0 and download it if necessary:
2.Stop the virtual machines and exit Parallels Desktop.
3.Start the installation package and select Uninstall option. Follow the on-screen instructions to complete the procedure.
4.Start the installation package and select Install option. Follow the instructions to complete installation.
5.Start Parallels Desktop from /Applications.
To update MacFUSE:
1.Open System Preferences from Apple menu, click MacFUSE.
2.Click Check For Updates button.
3.Follow the instructions to install latest MacFUSE version.