Vista can't ping Windows XP

Yes I still need Windows XP because DB2 7.2 is can't install success in Vista
So what i need to do now.

I install newly Windows XP and I can't not ping to see it.
But XP can ping my Vista

Is simple if you don't have any firewall or something more than windows xp firewall
many mistake is come from Exceptions setting.

Windows XP Firewall in Tab "Exceptions"
Check box on "File and Printer Sharing"

This will enable any component to use for share file and printer. Yes it make them to see each other too.

Logon Failure: The user has not been granted

Logon Failure: The user has not been granted the requested logon type
On Windows XP

Today I try to backup my old files in my old company PC but I cannot access shared folder
but old PC can access to my shared folder ( - -' )

yes they popup that message
and after on Google I found this

Download the following and install it

Windows Server 2003 Resource Kit Tools
http://go.microsoft.com/fwlink/?LinkId=4544

Then enter the following commands. (Attention: they are case sensitive.)

net user guest /active:yes
ntrights +r SeNetworkLogonRight -u Guest
ntrights -r SeDenyNetworkLogonRight -u Guest

The first command enables network access for Guest,
the two subsequent ones change two different policies to allow network access for Guest.

Yes after do this command it' work
So I post here for future use (I hope not found this issue again)

Ref : http://dotnetfree.blogspot.com/2009/08/logon-failure-user-has-not-been-granted.html