Encountered an error: drive-free network card model: TL-WN726N drive-free version
That's right, this is the product
Error 1: It is found that the correct wifi password has been entered but it still cannot connect, so first click on the network adapter to diagnose
Click to enter the following page.
Right click on the wireless network connection, and then perform our diagnosis
The exception thrown is: Windows cannot automatically bind the IP protocol stack to the network adapter.
So to find the information, please refer to the reference: (9 messages) Solution: Windows cannot automatically bind the IP protocol stack to the network adapter problem (manifestation: the computer suddenly cannot connect to the Internet, and only the airplane mode is left)_Little Jewish️的博客- The CSDN blog modifies the content of some services as follows
Then after solving this problem, refer to http://t.csdn.cn/T9TDM 
http://t.csdn.cn/T9TDM and found that the network attributes need to be modified
So another error
Error 2: Some controls on this property page are disabled because one or more other web page properties are already open. To use these controls, please close all property pages and reopen this property page
So refer to http://t.csdn.cn/585Pw http://t.csdn.cn/585Pw http://t.csdn.cn/8HlcK http://t.csdn.cn/8HlcK http:// t.csdn.cn/Sg11L http://t.csdn.cn/Sg11L http://t.csdn.cn/L8ARG http://t.csdn.cn/L8ARG
Modify the following content and only keep the checked content.
In the end, an error may still be reported and the network cannot be connected. At this time, you can download a 360 security guard and use its first aid tool for network disconnection to diagnose and repair the network.
Download its offline version installation package
360 Security Guard offline installation package download-360 Security Guard offline installation package computer version v13.0.0.2097 official version- Duoduo software station (ddooo.com)
http://www.ddooo.com/uppic/211207/202112071621226243.jpg 
http ://www.ddooo.com/uppic/211207/202112071621226243.jpg
You can install it directly, you can choose to install it on other disks, anyway, you can uninstall it when you are done using it
Use the first aid kit for network disconnection, and after repairing errors such as DNS and DHCP services, you can successfully connect to the network after restarting. I hope that friends who encounter the same problem can solve it as soon as possible.