visa error unless logged in as admin

[GDthomas]

I'm installing a LV program on several computers running Win7. It uses VISA to communicate with three separate instruments. If I'm logged in as admin everything runs perfectly but when anyone without admin rights logs in I keep getting VISA error "resources not found". This seems to be the two serial ports on a card, COM1 which is the on board port is working. I installed this on an identical computer yesterday and did not have this problem.

[RavensFan]

When you are logged in as the other user, what do the serial ports show up as in Device Manager?  What do they look like in MAX?

I wonder if there is a setting, possibly some sort of Windows Group Policy that is locking out serial ports for non-admins.

Is this a real serial port (with DB9 connector) or is this a USB-RS-232 converter which gives a virtual com port?  Perhaps if group policy is to disable USB ports for non-admins, it is blocking the converter from working.  Just speculating.

[GDthomas · Accepted solution]

Thanks for the answer. I seem to have the problem solved. I basically just reinstalled the serial ports and VISA and the problem went away.