Step 1: Update the network driver.
Steps to update network driver:
1. Click on start button.
2. In the search box type devmgmt.msc and then press enter.
3. Select the network card device and right click on it
4. Now select properties.
5. In the properties window, under Driver tab, click on Update Driver button.
6. After the installing the updates restart the computer.
For more information visit:
Step 2: Try resetting the TCP/IP stack.
To reset the TCP/IP stack go to this article and either click on "Fix it for me" or follow the instructions to fix it yourself:
If still the same problem persists then try the next method.
Step 3: Try the Network troubleshooter in Windows 7
follow the instructions in this link
you may try this link also
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