Hi,
The resolution to your problem is available on Citrix Support portal.
Follow the instructions on how to remove Citrix receiver manually:
Link: http://support.citrix.com/proddocs/topic/receiver-30-windows/ica-install-manual.html
For more information and help on removing Citrix program please visit Citrix forum at
http://forums.citrix.com/support , and post your questions.
Hope this information helps.