Windows/Delete Unowned Folder

Run from a user in Administrators group, and from a command line window elevated to Administrator permission

# Take ownership as self
takeown /f "C:\Path\To\Folder" /r /d y
 # OR
# Take owenership as Administrator group
takeown /A /f "C:\Path\To\Folder" /r /d y

# Give full permission to Administrator group
icacls "C:\Path\To\Folder" /grant Administrators:F /t

# remove the directory
rmdir /s /q "C:\Path\To\Folder"