If everything is normal, you can find the uninstaller in the Startmenu entry. Goto “Start” ⇒ “Programms” ⇒ “GECAMed” ⇒ GECAMed Uninstaller

If you have a verion of GECAMed installed that is smaller than 1.0.2, you will not have an uninstaller.
It was added in version 1.0.2 Therefore you have to download the gecamed_uninstaller_1.0.1.zip sepparately from here.
Extract the folder uninstall in your GECAMed install folder and run the GECAMed_Uninstall.bat from this folder. It will remove the GECAMed application.