Hello and welcome to the forum.
In addition to what Saltgrass has already suggested, please open a command prompt and type
net use
That should produce a list of any mapped network drives. I suppose it's possible that some software product may have created a new network location that perhaps is no longer available and as Saltgrass says they should be listed and enumerated in the "Computer" window under "Network Location(s)"
Keep us posted, interested in see how this shakes out.
Regards
Randy