Windows PCs are controlled by a series of permissions and scripts in an enterprise environment such as ours. Normally when you log into your PC, a printer script runs that looks at the current location of your PC, and assigns printers based on that location. Sometimes that script can get interrupted or not even execute properly, so the printers get all messed up. The fastest solution is normally just to log out, and log back in again. Failing that a full restart of the computer will normally cause the script to function properly.