Connect to Database 11gR2 on Windows7 x64

Hi,
I got problems by conneting to Database 11gR2 on Windows 7 Premium x64 from XP client.
There is no problem connect on the host of the database using the logical PC-name or the IP-address or localhost.
I copied the tnsnames to a XP client using the logical network name (pc4) and alternatively to IP address. Ping works fine tnsping timed out.
Where is the my fault?
Thanks
Siegwin

This is a duplicate post. Please do not respond to it.
Please change the subject of one of these to "Please Ignore."
Thank you.

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