Hi John,
If you do not have an ezusrfil.ld4 file in the \softrak\system directory, then what you can do is simply rename the one you currently have in \ASP. Upon opening Quik Check for Windows, the ezusrfil should be recreated. You will be required to use SYS for both the user name and password, and all other users that may have been on file will have to be re-entered.
Should this not help (I think it will), could you post what sort of network setup you have (ie Novell/NT/Peer-Peer) and any other pertinant info such as where the programs and data are located, etc? Thank you.