Installed New Nvidia Driver - No Connections Available?

After getting the cable set up (some new wireless modem that comcast gave us) we were able to connect to the internet once, after putting in the password, but after that the next day our computer would not recognize any networks at all, it's just say no connections are available.I already:-restarted computer,-reset modem (we used to have a router and a cable modem but now only the wireless modem)-rolled-back drivers,-disabled then re-enable driver (did NOT uninstall or reinstall)-opened the computer up, take out the adapter, tryed and got the dust off-unscrewed and rescrewed antenna- tested a laptop, and it had an internet connection - and probably a few other things which I can't rememberLast time on the computer, I uninstalled a few things with revo, ran registry cleaner, browsed internet, and installed a new nvidia driver (after the problems arose). I was able to install a netgear wireless usb adapter (which is how I'm on the internet right now), but it frequently gitters and I can't use the NetGear for very long seeing as how a different computer uses it.