Help please,

I have Vista desktop with the following specifications:
1. Vista Ultimate
2. On-board network adapter Intel PRO/100 VE
3. Two dial-up connections
4. One external ADSL modem Aztech DSL600EU (I used USB cable and I have to
switch off the modem manually after finish)

And the other desktop is XP with the following specifications:
1. XP Service Pack 2
2. On-board VIA Rhine II fast network adapter

The problems a

1. My primary LAN, "Local Area Connection" to share files between "Intel
PRO/100VE" to/from "VIA Rhine II" is labeled as "Unidentified Network".
This, I think, makes everytime I restart Vista desktop the setting revert
back to "public".
How to make this connection recognized as a safe network?

2. If I turn on my DSL modem, it'll detected as "Local Area Connection 2"
and will be labeled as "Network". With this connection, I can change the
locations from public to private or vice versa no problem, even after restart
the setting still memorized.
But If I used ICS to share this connection, after I turn off the modem and
restart the Vista desktop, my XP desktop will have limited connectivity.
I have to turn on the DSL modem then share any of dial-up connections to fix
it.
How to share internet connection coming from "Local Area Connection 2"?

Thanks in advance!