For Windows Users:

Note : Incorrect changes to registry settings can cause serious system problems that may be irreversible without reinstallation of the operating system. You must back up your registry before making any registry changes. We are not responsible for damage resulting from incorrect use of the Registry Editor.
  1. Uninstall the Citrix client from your computer.
  2. Navigate to C:/Program Files and delete the citrix folder if it exists.
  3. Go to Start > Run > type in " Regedit" and click Enter
  4. Navigate to HKEY_CURRENT_USER > Software and right click the Citrix folder
  5. Click Export and save it to your local directory
  6. Right click the Citrix folder and click Delete.
  7. Navigate to HKEY_LOCAL_MACHINE > Software and right click the Citrix folder
  8. Click Export and save it to your local directory
  9. Right click the Citrix folder and click Delete.
  10. Install the Citrix client.
For Mac Users:
  1. Uninstall the Citrix client
  2. Install the Citrix client