Windows 7: Issue with mapped drives in browse window

Scratching my head a on this one - got a 7 machine that can browse & see mapped network drives in computer and through the network. But when software is installed that browse window isn't showing the mapped drives for installation or for a mapped data path. Or, with software installed to the C drive the browse still won't pick up the mapped drives to change the data path (from within the software). UNC paths work fine. What ingredient am I missing?

what software?

Well it's two packages, both tax related software but I think to have solved the problem.

Realising 7 has elevated security and the network that particular PC is attached to may not.
Control panel
Network & Sharring Center
Advanced settings
File Share connections
Enabled file sharring for devices that use 40 - or - 56 bit encryiption.

That should fly, will post later on this.