You have the option of repairing your network stack manually or repairing your netword stack using Microsoft's FIX IT option.
Repair Network Stack Manually
1. Click Start and then click Control Panel.
Note: If you are using Windows 8, you can find the Control Panel by moving the mouse pointer to the top right of the Desktop screen and then clicking on Settings.
2. If the View by option is set to Category, click the User Accounts and Family Safety icon, and then carry on with the next step. If not, skip to the next step.
3. Click the User Accounts icon.
4. Click Change User Account Control settings.
5. Slide the bar down to Never notify, and then click OK.
6. Click Yes on the User Account Control window.
7. Restart your computer for the changes to take effect.
8. Once the computer restarts, click Start. In the Search programs and files box, type netsh int ip reset resetlog.txt. In the results displayed under Programs, click the netsh int ip reset resetlog.txt link
Alternatively, to run NetShell, tap the Windows key and then the R key on the keyboard to open the Run window. Type netsh int ip reset resetlog.txt, and then tap the Enter key on the keyboard.
- When you run this command, it will rewrite the pertinent registry keys used by the Internet protocol (TCP/IP) stack. This achieves the same results as removing and reinstalling the protocol.
9. To enable User Account Controls, click Start, and then click Control Panel.
10. Click the User Accounts and Family Safety icon, and then click the User Accounts icon.
11. Click Change User Account Control settings.
12. Slide the bar two notches up, as shown in the screenshot below, and then click OK.
13. Restart your computer for the changes to take effect. To restart your computer, click Start, click the arrow next to Shut down, and then click Restart.
Repair Network Stack Automatically using Microsoft's FIX IT option
To fix this problem automatically, go to http://support.microsoft.com/kb/299357 and click the Microsoft Fix it link.