In the event that the tool only successfully launches when run as an admin, this could be occurring because the non-admin user that is launching the tool does not have permissions for the installation folder, to the run tool components, or to the workspace.
This may be caused as a result of various windows security settings and configurations. To resolve this issue, add the non-admin user, directly to the folder security settings.
Navigate to the folder that contains the Essentials Tool installation folder (C:\Program Files\Quest\Essentials). Right click and select Properties.
Navigate to the Security Tab, and select Edit group and usernames and grant "Full Control" of the Essentials folder on local PC