Dell Inspiron 14r Wifi Detects Networks But Won't Connect

I'm visiting my parents for the summer and I brought my laptop with me and the wireless was working fine for the first month or so. One random day it stopped working and will not connect. I called dell support and for some reason it just started working when I was on the phone with him, but for the next couple of days it would connect for awhile then not connect 15 minutes later. It's not the router because it won't connect to other networks, the dell support guy says its not the hardware (everything in the device manager says its fine also), It works when the ethernet cable is plugged in, I installed all the latest drivers for the network adapter (Intel Wifi link 1000 BGN), I installed a registry fix program and for a little bit it was working with some networks, but only limited access.