It looks like you have modified screens. Those are linked to the user within the database. Reinstalling ES on a workstation for the same user shouldn't have any effect on that. If you have a new user, in ES, you would go to System / Utilities / General / Link Resources to modified screens to "copy" a screen from one user to another.
The folder that the Macola ES programs are installed in don't contain any data, just program files (if you have custom ES Crystal reports, they would have to be copied to c:\program files\Exact Software\rpt folder)
For new users, there are things within each company that you have to do. Create the resource, link the resource to custom sceens, link the resource to the security roles that you want them to have.
Kevin Scheeler