Hi MichaelThere are a quite a number of genius's on this board - I'm hoping that one of them can step in and help us out 
Have you considered using the autoupdate feature of NAV. Bryce has done a lot or work in this area - he even has some admin scripts that can deploy and configure NAV automatically for you ... I'm hoping he can step away from his busy consolidation and help you out...
Houston - we have a problem...
Have you tried searching the board for other options ? NAV is a big topic arounf here, you'll probably find about a million posts on this subject ...
Here's my two cents. I'm thinking maybe you can setup a scheduled task to do this... it would work like this ...
1) Configure a task in Task Scehduler to run at user logon ...
2) Provide the username and password of a domain account that has access to your NAV shares. This account would be (what we call anyway) a "functional id". One where the password never changes 
3) Logoff your workstation and pray
I've never actually tried this but eh - you never know !
-Shawn