Symptoms
You are unable to start a virtual machine after upgrade of Parallel Desktop because of the error message:
![](https://kb.parallels.com/Attachments/21745/Images/Screen%20Shot%202012-08-31%20at%205.41.00%20AM.png)
Resolution
WARNING: We strongly recommend to backup your Virtual Machine prior to following the instructions below!
- Launch Terminal application from Applications/Utilities
Paste the commands into Terminal (one by one; hit return after pasting each command)
sudo su
(type your Mac user password (your Mac user should have Administrator's privileges) and hit return. You will not see characters while typing)
for pid in $(ps aux | grep "Parallels Desktop.app" | awk '{print $2}'); do echo kill -KILL $pid; done for kext in $(kextstat | grep parallels | awk '{print $6}'); do kextunload $kext; done rm /System/Library/Extensions/prl* rm -rf "Parallels Desktop.app"
Do the same to uninstall all Parallels Desktop 7 traces. Paste the below listed commands as is into Terminal (one by one; hit return after pasting each command).
Note: If the Terminal does not show any output after executing the command it means the command has been performed successfully. If you see 'No such file or directory' message it means this file or directory has been removed by the regular uninstaller and you may continue.
sudo launchctl stop com.parallels.vm.prl_naptd sudo launchctl stop com.parallels.desktop.launchdaemon sudo launchctl stop com.parallels.vm.prl_pcproxy sudo kextunload -b com.parallels.kext.prl_hypervisor sudo kextunload -b com.parallels.kext.prl_hid_hook sudo kextunload -b com.parallels.kext.prl_usb_connect sudo kextunload -b com.parallels.kext.prl_netbridge sudo kextunload -b com.parallels.kext.prl_vnic sudo kextunload -b com.parallels.filesystems.prlufs sudo rm -rf /Library/Parallels sudo rm -rf /Applications/Parallels\ Desktop.app sudo rm -rf /Library/LaunchDaemons/com.parallels.desktop.launchdaemon.plist sudo rm -rf /Library/LaunchAgents/com.parallels.* sudo rm -rf /Library/Python/*/site-packages/prlsdkapi sudo rm -rf /usr/bin/prl_perf_ctl sudo rm -rf /usr/bin/prlctl sudo rm -rf /usr/bin/prlsrvctl sudo rm -rf /usr/bin/prl_disk_tool sudo rm -rf /usr/share/man/man8/prl* sudo rm -rf /var/db/Parallels/Stats/ParallelsDesktop.* sudo rm -rf /usr/lib/parallels sudo rm -rf /Library/Filesystems/prlufs.fs sudo rm -rf /Library/Preferences/Parallels sudo rm -rf /Library/Logs/parallels
Go to Applications --> Utilities --> Disk Utility, select your Mac Hard Drive and choose Repair Disk Permissions option.
Restart your Mac.
Now you may install Parallels Desktop:
Cause
Parallels Desktop 7 kext files were not properly removed.
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