XP Windows 7 is not accessible you might not have permission to use this network resource

I cannot access a domain computer of Windows 7 64 by \\computername from any other Windows XP machine. But I can open it without problem and see the share folder from other windows 7 64/32 bits computer.

When accessing this W7 64bit computer from XP, error as below

\\computername is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions."

The specified server cannot perform the requested operation.

If trying to access \\computername\sharefoldername

Error as below:

"The specified server cannot perform the requested operation."

Please help

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