If
you try and connect to an XP computer and are shown a logins
screen with only the computername/Guest,
You may need to change one of the Local Security Policies:
Got to Control Panel - Administrative Tools
Go to Local Policies - Security Options
Check teh Network access: Sharing and security model for
local accounts
Set it to Classic - local users authenticate as themselves
Homepage
Guest
Only Network Access
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XP Tips 
