Well, in this case, what is advisable, login to your router's page and then check for the SSID and the encryption algorithm which you have selected.
After changing the settings also, if your computer does not connect then try any other computer (if you have), whether that can get connected to your home network or not.
Upon getting a negative result, you may do a power drain. Here are the steps for that:-
(i) Shut down your computer first
(ii) Turn off the wireless router.
(iii) Then shut down your modem (given by your ISP) and then wait for 30 seconds.
(iv) Hereafter, restart your modem first, and let all the light lit up (as usual) and then turn on the router and then the computer.
It should fix the issue but upon failing this as well, you can try resetting the router to the factory settings. This sounds big but it would not take more time...................All the best!!!
Please feel free
to let me know, if you need any additional help!!!