Assume that you use one of the following Realtek network adapters on a computer that is running Windows 8:
After you upgrade to Windows 8.1, the network connection is not available.
This issue occurs because the driver that is included in Windows 8.1 is used instead of the correct driver.
How to obtain this update
This update is applied when you upgrade to Windows 8.1. No interaction is required to apply this update.
To apply this update, you must be running Windows 8.1.
To apply this update, you do not have to make any changes to the registry.
You must restart the computer after you apply this update.
Update replacement information
This update does not replace a previously released update.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.