Can't join workgroup

I feel like half a moron for needing to ask this question.  I have 3 PC's.  One is brand new.  Workgroup is workgroup. All C drives are shared with everybody, administrators, and system all in shared permissions group.  Two of the machines talk without problem to each other.  New device can see both others but I cannot map a drive (username/password issue) to either.  I am mapping \\server\share with no success.  What am I missing?
Thanks,
jwhite
jwhite273Asked:
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jwhite273Author Commented:
All set.  EU provided wrong credentials.
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jwhite273Author Commented:
EU provided wrong credentials.
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