First, we'll presume you're using Windows, XP or above. Secondly, the module can be renamed, and there are numerous versions of it. A little detective work is needed.
You need to look at the system processes, and run each one down by name, then look them up using a search engine. See running processes by opening Task Manager to look at each running process. By clicking the Services tab, you can do the same thing. Each process can be searched, using a search engine. Some processes come and go, and the ones that are marked as stopped or not started, are not under suspicion. All of them can be found on a search engine, if you're methodical. Citrix's modules should be labeled as such, and will stick out like a sore thumb in the services tab. You can stop them from there, subject to understanding that you may, by doing so, take the responsibility for this. If the module's name in the Services tab listing is obscured, it won't say Citrix, of course. It's up to you to attempt disabling this module by Stop(ping) it. You may have to reboot, so have your work saved before you attempt doing this to any module.
You can also look inside the system registry for processes that start when the computer is started, or your username is logged in (HKLM), and this is discussed elsewhere, and is not infallible. You're advised to be wary about the repercussions of stopping any particular module, or editing the registry as they may brick your system, and your actions are your responsibility.