snake454,
Please give very careful consideration to any recommendation that tells you to modify your firewall settings. It is almost always done by someone who has no actual knowledge of the efficacy of the various Windows firewalls that are part of both XP and Windows 7 - and you should never have any other 'host-based' firewall running on a Windows OS. (Perimeter firewall - yes, host-based - no.)
It should also be noted that frivolous re-configuring of Windows firewall settings will just about guarantee that some of the protections afforded will be downgraded.
In your original post, you mentioned that all of your computers are in the same workgroup (as are mine) and you mentioned having a 'shared' folder for your Admin Tools.
Your setup and mine are virtually identical and my suggestion was based on exactly what works for me.
Please give the "same username and password" suggestion a try and let us know if that worked for you.