Windows Vista Networking Problem

[mtaman02]

Ok I finally have given up and need the help of the CD Community once again!

The Problem: Unable to network 2 Vista Computers (One Laptop the other a PC) to 3 XP Computers (1 Laptop the other 2 are PCs)

What was done: Ensured that the Workgroup is the same, All computers have their own IP Automatically assigned to them, Ensured all computers are named differently, Ensured shared folders are setup correctly. Vista Machines will see the Vista Machines on the network as does the XP Machines seeing the XP Machines on the network.

Noticable Problems on VISTA computers that need to be corrected:
RPC Service under the network adapters properties is not set correctly to be using the Windows Locator as the Name Service Provider and will not stay set once that option is chosen. The option clears upon closing the window.
Unable to access the Built In FULL FLEDGED Administrator Account - No option was made during the Computers First Run to set up the account & password. It did ask to set up the Computer Users and when typing in the Administrator Name it says the account is already made and a duplicate cannot be created. Having this account may solve problem #1 and correct all other problems.

The Question:
Does anyone know how to access & setup the Built In Administrator Account in Vista even though you are suppose to set it up upon OS Installation?
How do you make Vista see XP and visa versa perfectly?
How do you keep the Name Service Provider Set?