Issue : You need to uninstall Presentation server but you are getting errors such as “error 25623 unable to unregister subsystem “ImaNDS.dll” and the uninstall fails. This could be caused by your server losing connection to the farm, the data store has crashed or the server has no network connections.

Resolution : Citrix Recommend you to Ensure that all hotfixes and Hotfix Rollup Packs have been removed before uninstalling the Citrix Presentation Server product. There is an easy way to force a presentation server uninstall, Browse to the presentation server install directory where the file mps.msi is located. Now you need to run the command

msiexec /x mps.msi CTX_MF_FORCE_SUBSYSTEM_UNINSTALL=Yes /L*v c:\output.log

Note “/L*v c:\output.log” is not required but could be helpful should the uninstall fail. You can run this command by either opening a command prompt and browsing to the directory, or you could create batch file with this command and place the batch file in the same directory as mps.msi.