Simple Workgroup

>>>I have a Workgroup with two computers (A and B). A is WindowsXP SP3 and B
>>>is Windows Vista Ultimate.
>>>
>>>The four partitions on A are configured to be shared by local and network
>>>users. The two partitions on B are configured to be shared by local and
>>>network users.
>>>
>>>The accounts used on both machines are the same names and passwords. They
>>>all are Administrator accounts. UAC is turned off on Vista.
>>>
>>>Previously this worked perfectly for me. I could access all six partitions
>>>from either machine and it never prompted me for a password.
>>>
>>>Something changed with no known action from me.
>>>
>>>Now I can access all six partitions from node A. I cannot access the four
>>>partitions on node A from node B. I can only access the two partitions on
>>>node B.
>>>
>>>In the Network display on node B I can see node A.
>>>In the Computer display on node B I can see the four partitions on node A.
>>>
>>>If I attempt to access a node A partition from node B it throws up a dialog
>>>box asking for a user name and password. Both are blank in the dialog. If
>>>I respond with the current username and password it simply asks me for the
>>>information again.
>>>
>>>How do I recover from this "feature" and go back to my simple two node
>>>workgroup that permits access of all partitions from either node?

>>
>>Check the permissions on the shared partitions on node A, and make
>>sure that they include the "Everyone" group.
>>
>>If that doesn't help, un-share and re-share the partitions and see if
>>that fixes the problem.

>
>I removed the share form all four partitions on Node A and reloaded XP. I
>then reestablished the shares. There was no change in the problem,
>
>I found out how to display the security tabs finally (the SP3 installation
>hid them). Group Everyone had all permissions checked except FULL CONTROL.
>When I changed that in the root the problem was solved.
>
>Apparently a lot of people are finding they need to go through this process
>after installing SP3.
>
>Because my experience with Vista was so terrible I was immediately assuming
>(incorrectly) that this was a Vista problem on node B.
>
>Thank you very much for getting me on the right track. It is now running
>once again the way I want.
>
>... Thom