Recently I am unable to access my decktop from the laptop but I can access
the laptop from the decktop can anyone help me. Thanks

I would check the firewall first. Or this troubleshooting may help,

troubleshooting is not accessible errorWhen try to access a remote computer,
you may receive the following error messages: "....is not accessible. You
may not have permission to use this network ...
      www.howtonetworking.com/Troubleshooting/notaccessibale0.htm


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Yep.. Check the desktop to see any firewall (Windows firewall, antivirus firewall) blocking the access..

Also take a look on following article, might be able to help..

http://www.home-network-help.com/troubleshoot-network.html

good luck..

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