Everything on the machine worked just great when we uninstall FortiClient ..
Understood. If there is a conflict between FortiClient and another application (say, another AV or VPN product, or something completely different), uninstalling one, either FortiClient or that other application, will eliminate the conflict on that system.
It is to be expected that end-users will create their systems to suit their needs. As they do so, they may unintentionally create conflicts. Some cannot be resolved (end-user has to compromise). The software developers usually need access to information on what is happening in order to determine how to resolve it.
Without your support or input, progress may not be achieved.