Can't identify network

My computer has been unable to identify the wireless network I have been connecting to (for at least 6 months) for a few months now. I can not get it to work no matter what I do. It's not the router, because all my other devices connect to it just fine. I've tried resetting the router and that did nothing but take time out of my day (2-3 hours for the computer to tell me it still couldn't connect to be exact). If anyone knows of a way to diagnose this, please help me. I just started school again and not having a laptop can hinder a lot of my studying. Thank you, Breanna