Keep getting this error when I try and de-activate on my laptop.

UnauthorizedAccessException
  Access to the path 'C:\Program Files\MicroFour\StrataFrame\License\MicroFour License.dll' is denied.

Source     : mscorlib

Stack Trace:
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.File.Delete(String path)
   at MicroFour.Licensing.ActivationClient.UninstallLicenseFile()
   at MicroFour.Licensing.ActivationClient.RequestDeactivation(Boolean isExpired)
   at MicroFour.Licensing.ActivationClient.RequestDeactivation()

Please advise.

thanks

Geoff Hirst