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On my home network there are W8-A, W8-B and W7 machines. There is no problem networking among these machines except from W8-A to W7. The shared folders on the W7 are displayed on W8-A but if I attempt to click-open any one of them no ID/PW is asked for and the following message is displayed:

"You do not have permission to access . . . . . Contact your network administrator . . . "

W8-A <--> W8-B OK
W8-B <--> W7 OK
W8-A <-- W7 OK
W8-A --> W7 NG

W8-B and W7 are logged in by the same ID and password, but W8-A is logged in by a different ID and PW.
I can open any folder of the W7 from W8-A *if* W8-A is logged in by the same ID and PW as for W7/W8-B.

I wonder what could be wrong. Any idea?

Let me correct my following statement:

Windows 8-B and W7 are logged in by the same ID and password, but Windows 8-A is logged in by a different ID and PW.

". . . but Windows 8-A is logged in by a different ID and PW" is actually ". . . but Windows 8-A is logged in by a different ID but the PW is the same as others for logging in to W8-B and W7".
I changed the PW to one being unique for the ID used to log in Windows 8-A and the problem is resolved. I did this for trouble shooting purpose but still do not know why the same PW caused the problem. Could anyone explain why?

Please note that the ID/PW for the Windows 8-B was the same as that for W7 but there was no problem accessing Windows 8-B even before changing the PW.

Edit: This problem has been resolved.