To reinstall Parallels Tools with Parallels Desktop
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Click Actions button at the top Mac menu. If your Windows is running in Full-screen mode and there's no Mac menu, put the cursor at the very screen top and leave it there for a while, or press Option+Ctrl.
 - Select Reinstall Parallels Tools. If nothing happens open Windows Explorer and double-click Parallels Tools virtual DVD-drive to start reinstalling.
 
To reinstall Parallels Tools from inside of Windows
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Launch Windows virtual machine.
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Disable antivirus software in Windows.
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Click Start > Settings > Apps > Apps and Features (or right-click on Start button > Control Panel > Programs and Features) and remove Parallels Tools if present.

 - Proceed with reinstallation.
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Restart Windows.
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In Mac menu bar, click on Actions (Virtual Machine in older versions) > Install Parallels Tools.
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Restart Windows again.
 - Enable your antivirus.
 
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