SOLVED Win 7 Home Premium Network problem

[cma6]

I have four Win 7 Home Premium systems on a LAN. Systems A,B,C can see each other bi-directionally, at least to the extent that I can create shared folders on each of these 3 systems, which shares are fully accessible on the other 2 systems.
I just added a new system D to the LAN. From System D, I can see shares on A,B,C.
From B and C, I can see shares on D. But from A, I cannot access D in any way nor see shares on D.
Although system D shows up in A's network folder, when I click on D, I get the standard error message: "You do not have permission to access D."
If try to map a network drive from A, I am given the option of mapping "\\D\share", and I click on "Finish", a dialog comes up with "D\share", presumably a Username, (where share is the name of a the shared folder on D), and I'm asked to provide a password. I have tried the Homegroup password for A but that didn't work.
I left the Homegroup on D, which Homegroup was created when Win 7 first booted up on D.
Any creative ideas would be appreciated.

 

[TrainableMan]

This is marked as solved. If you were able to fix it please post back as to how you accomplished it.

 

[cma6]

Hi TM:
When trying to access a shared folder on system D from system A, I enter as Username: "systemA Computername\systemA user name" and enter as password the Homegroup password of system A, which can be found on system A.
This is a good enough workaround, as System A doesn't really have full access to System D, but at least has full access to the shared folders on System D.

 

[TrainableMan]

Aren't all your computers in the SAME homegroup? If so then the homegroup password should be the same on all of them.

 

[cma6]

No, that was the problem, not all on the same Homegroup. I had to leave the Homegroup on System D before I could make this work.