I suspect you had created a C:\ISTS folder on the workstation that the Admin owns and the user does not have access to.

Delete the C:\ISTS folder.  Then, while logged into Windows as the user (not Admin) create C:\ISTS and copy any file into it so that it is not empty.

I had an XP workstation die, so I robbed another DBA workstation from another location that was seldom used.   When I hooked it up the old workstation at the new location,  I found that it would not print to the Brother printer.  It would not print a Word Doc or even a simple TXT file.  After some  research  I figured that the user didn't have printer privileges.  I tried all different methods so that the user could print to no avail.  I finally gave up.   Then I tried to see how the user would function in DBA.   When I tried to print something  (list it to the screen) I would get "  An error has occurred while accessing a non-TAS file.  - C'|ISTS\WHOAMI.DBA.   I knew that I needed to delete the file as the admin and then log in as the user and create another ISTS file for him.    
 
Of course this fixed it, but much to my JOY it seems to have also fixed the problem with not being able to print to our Brother printer.