could be an issue with the network frequency mismatch.
Either log into your router: Connect your ethernet, go to command prompt and type ipconfig. This will give you the default gateway for the router, enter this default gateway address 192.168.1.1 (usually) in your browser and log in ( Username usually admin, password is either admin or password, should be written in the back of the router), go to wireless settings and then change the wireless mode to b,g,n mixed. also change your wireless channel to a lower one like 6,8 or 10
Also while you are in the wifi settings go check if your wifi password is correct as this may have changed when you reset the router.
Additionally, you can go in your pc, in control pannel>Network and Internet>Network Connections. right Click on your wifi adapter, click properties and click configure, in the configure click the advanced tab and make sure 11b is set to (long and short) and 11n is enabled (this gets disabled sometimes). Click save and try to reconnect.
