Hi, Jumpjam
I may have an answer to (1) based on a rapidly fading Windows knowledge.
When dealing with MS Domains, you need to get you Windows PC to 'join' the domain. I can desribe that for WinXP...perhaps it willb e the same.
Right-click on My Computer, select Properties from the menu. A dialogue box will open, with vaious Tabs. Click on Computer Name....you will now have an option to join a domain. Click on Change. Now click on 'Domain'. You will be asked the Domain Administrator's username and password. Give them, press <Enter> and wait a few moments(....depends on your hardware on the PC and the Domain Controller).
Eventually, you should get a message that your PC has joined the domain.....or a rejection message. (If rejected, check the spelling of domain name, admin username and password).
Hopefully, this will get your PCs and the PDC talking to each other.
Cheers