The two computers are networked, and the video files exist only on the Office PC.
After some rethinking: For your setup, a good solution might be:
(i) Share your media folder on your LAN. The Music folder can be accessed from both PCs via \\[Computer Name]\[Share Name]
(ii) In PVD, rescan with \\[Computer Name]\[Share Name] as base address.
(iii) In MC, move files to \\[Computer Name]\[Share Name] .
(iv) Put the MC database in the shared folder. Access it from the HTPC as read only. Access it from the office PC as usual.
Number iii is easy if you can reimport. Can you? Otherwise, there are some "tricks".
An alternative to iv could be to set up a Tremote (i suppose) but someone else will have to provide instructions on how to do that and what the limitations are in such a setup.
With this solution, you don't have to worry about drive mappings ("G:") and the trouble those cause.