Question
I need to reinstall Parallels Tools in Windows virtual machine.
Resolution
Launch Windows virtual machine.
Disable antivirus software in Windows.
Right-click on Start button > Control Panel > Apps and Features (Programs and Features, or Add/Remove programs for older Windows versions) and remove Parallels Tools if present.

Or

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