Can't connect to workgroup from domain

Question

I have a small domain and also a Win7 and a Vista machine each in a workgroup. I'm unable to connect to C$ or Admin$ on the workgroup machine from any of the domain machines. I'm using an account on the workgroup machine using an account that's
in the local admin group using hostname\username format (also tried
username@hostname). File and Print Sharing is enabled and I even tried turning off the firewall but that didn't help. I can ping them, I just can't connect to C$ or Admin$. I've tried connecting to both
\\hostname\C$ and
\\IPaddress\C$.
Jonathan

Answer 1

Try this 
http://www.winsupersite.com/article/windows-7/windows-7-feature-focus-homegroup
or
Click on the start menu and type secpol.msc in the search box. Browse to "Local Policies" => "Security
Options". 
Search the option as "Network Security: LAN Manager authentication level" make double click to open it. Click
on the dropdown menu and choose "Send LM & NTLM - use NTLMv2 session security if negotiated". Now Apply the configured settings.
In the setting of Advanced sharing, Page of Network and sharing center, you need to have it set as Work/Home
profile and follow some guidelines and try out this :
-Enable network discovery
-Turn on file and print sharing
-Turn off password protected sharing
-Use user accounts and passwords to connect to other computers
Another settings like encryption that I have set as use 128 bit encryption.
and check the related policies with the following way :
1. Type “gpedit.msc” in the Start=>Search box.
2. Browse “Computer Configuration”/Windows Settings/Security Settings/Local Policies/Security Settings.
3. In the right pane, enable the following policies:
Network access: Allow anonymous SID/name translation
Network access: Let Everyone permissions apply to anonymous users
Regards, Kalyan.