Please follow the below listed steps until your issue has been resolved:

Note: Get the approval and assistance of your IT staff before performing this task
  1. Open the Registry of your Windows machine (for XP machines; forVista & Windows 7).
  2. Navigate to the following directory: HKEY_CURRENT_USER/software/citrix.
  3. Select the citrix folder.
  4. Backup the registry.
  5. After the registry has been backed up, delete the citrix folder.
  6. Reboot the machine (if prompted) and re-install the latest Citrix Client appropriate to your machine.
  7. Follow the steps for ensuring citrix can communicate with your browser. Attempt to log into your hosted product again.
  8. Install the newest version of the Citrix plug-in on the machine, overwriting the current installation and attempt to launch your product again.
  9. Re-create the affected windows profile and attempt to install the citrix plug-in again.
  10. Re-image the affected workstation and attempt to install the citrix plug-in again.