2) If it's a router problem, if it worked before, it won't work for the time being. My own way is to disconnect the power of the router and plug it in. See you later. If it can be restored to the factory settings, it can be used in strict accordance with the instructions. You don't understand, so it is not recommended to set it at will (this is sometimes caused by the slow or failed IP address search of the router under the premise of correct physical connection, not the router is broken).
If I can't solve it all the time, I suggest calling the customer service of the router. They have telephone online guidance. If I encounter problems that I can't solve, it is very useful to ask their advice. They will provide correct advice for your setup or operation.
3) If the wireless switch is off, just turn it on. If it is a software wireless connection, the software is not easy to use, and it is normal to have problems frequently. There is no better way to use a router. In addition, the network card driver is not suitable or not suitable, and there is something wrong with the network cable interface or network cable.
4) If it is caused by system problems, it is recommended to restore the system or reinstall it.
Win78 10 restore the system, right-click the computer and select Properties, and select System Protection and System Restore on the right. Follow the steps. If you have recovery software, you can also use software to recover the system.
I practice that mobile phones or other computers can access the Internet, not necessarily your computer can access the Internet. Please look at the answer above and ask me any questions.
5) If the browser is not easy to use, it is recommended to test it with Google browser, which is very easy to use.
6) If you have any questions, please ask me.