The problem COULD be that you need certain references that are OK on the development machine but that don't exist (haven't been set up) on the distributed machines.
I have seen that error on machines when the user loads an Access app but the machine in question was never used for locally developed Office apps prior to that moment. (Not talking about using Word or Excel, but specifically apps that involved non-trivial VBA.) On the workstation used for development (where the .accdb exists), open the database, open a code window, and check Tools >> References to see what is checked in that list. If the same things AREN'T set up correctly on the end-user machines, that could do it.
The wired LAN should be just fine, so you can likely rule that out as a cause.