using a 32-bit OS - you can use Windows Search and the Add-in for Files on Microsoft Networks.
using a 64-bit OS - you can use Google Desktop (Search), and then add the local shares as additional paths.
After installing Desktop Search, download, unzip the zip file and run SetupGeneralCADDIndexer.msi to install the General CADD Desktop Search Plug-In.
click this link
These tools can help you if you want quick access to the families in your library, but your folder organisation leaves something to be desired...