Hello dnr, and welcome to the forums.
Check to see if you have integration enabled or disabled. If it is disabled the network does not appear. Now if interrogation is disabled it will allow you to run your GUI in 32 bit mode vice the 16 bit mode you will have with integration enable. Also check your "Settings" and ensure that under "Networking" that you have "Shared Networking (NAT) selected.
In the "Settings" check your "Integration" to see if all the features for integration are enabled. You can choose what drives, printers, and USB plugins you want shown in Explorer (file manager).
Hope this helps.