If all these ways can't work, the next method is quick and useful.
1.Click on Start up and select Control Panel.
2.Click View network status and tasks and when you enter, select Change adapter settings.
3.Right click on Local Area Connection and select Properties.
4.Select Sharing and make sure you tick Allow other network users to connect through this computer's Internet connection to enable connection, at last click OK.
To ensure and keep a fast running speed of your pc, it is necessary to update drivers in time. Don't know to how to update Reading steps below to learn update drivers by hand. Note: the updating process is for window 7 system.
1.Right-click on Computer icon on your desktop, choose Manage.
2.Locate and click on Device Manager on the Computer Management window appeared.
3.All the devices will be shown on the right side, double-click on the category of device and find the driver you wish to update.
4.Right click on the driver, and select Update Driver Software.
5.You will see a new window appears, select Search Automatically for updated driver software.
6.When the process is finished, click Close.