When un-installing a version of ScrewDrivers Server prior to v6.9.1, you may want to check the Print Spooler service for any dependencies. Un-installing ScrewDrivers Server versions prior to v6.9.1 will hang when trying to stop the Print Spooler if there are dependent services.
...
In this screenshot on a typical Citrix server, you can see the Print Spooler service has a dependency named Citrix Print Manager Service.
To prevent the ScrewDrivers Server un-install from hanging while trying to stop the Print Spooler, just locate the Citrix Print Manager Service server and stop it before running the un-install. Do this for any services listed as a dependency.
Proceed with un-installing ScrewDrivers Services. Don’t forget to start any dependent service you stopped above, when the Print Spooler service is re-started, it will not start dependent services!
Many thanks to George from Open Doors Technology for bring this to out attention!