Error:0x80070rcf: Network location can not be reached (window 7)

Hi

I suddenly find that from my desktop I am not able to access shared of my laptop. My laptop is running windows xp and desktop is running windows 7.
I have made a shared folder in xp and was able to transfer file by simply typing \\192.168.0.2 but now I can't do and it give me following error message :

Code:

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Windows 7 cannot access \\192.168.0.2

Check the spelling of the name. Otherwise, there might be problem with your network. To try to identify and resolve network problems, click Diagnosis.

Details :
Error Code : 0x800704cf
The network connection location can't be reached. For more information about network troubleshooting, see Windows Help.

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Network diagnosis say there is no problem. Also I think network is fine because I can use internet on laptop from destop.. some problem is with file sharing I think.