Have you tried running check disk on the main drive for this machine with the problem.
Right click the drive usually C: choose properties then click the tools tab, click on the check button to run check disk, a small window will appear, there are two options select both options click ok. Than previous window click apply and ok.
After this you need to restart and 5 stages of check disk will run.. don't press any keys otherwise check disk will be skipped.
If that can't be done you might try running the sfc/scannow command.
I'm not sure what you mean by about this workstation with the access problem being connected to a Wireless Ethernet Hub?
Is this the same as a Wireless network bridge or access point? You mentioned resetting the router but have you tried to reset this hub or bridge or access point?