Add Windows 7 in a workgroup (With XP / Vista)

Add Windows 7 in a workgroup (With XP / Vista)
There are some protocols configuration is occurring this error message >
~ Windows 7 can't access Share in a workgroup -

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