Source: qiuyi21.cnblogs.com
1 , download the latest official version of the driver
On Broadcom official website http://www.broadcom.com/support/ethernet_nic/downloaddrivers.php Download the latest official version of the driver for your network card, do not download the beta version.
2 , delete the system's own driver cache
At the same time press the WIN + x appear management menu, then press g Key to open Computer Management, left check "Device Manager", on the right, expand "network adapter" to find the Broadcom wired network card, as shown in:
Figure 1
Right click on select "Properties", select "Driver" tab, click "Driver Details" To view the driver file name, such as K57nd60a.sys:
Figure 2
Go to C:\Windows\System32\DriverStore\FileRepository, search for the driver filename shown above K57nd60a.sys, find it in a directory, like this directory name netk57a.inf_amd64_ 414FFBD8CDFF16B5, and then delete the directory, or cut back to a different location. Note that you may want to change the permissions to delete or move the directory here.
3 , replace driver
In the location of Figure 1, the right-click menu selects "Uninstall" and "OK" to uninstall the driver, then click on the main Menu "action", "Scan for hardware changes", the other Ethernet controller devices will appear, right clicking and select "Update Driver software" as shown in:
Figure 3
Then "Browse the computer for driver software" install Step 1 to download the latest official version of the driver.
Broadcom wired network Card The solution of using system's own driver to break the network under Windows 8/8.1/10