Wi-fi connection problem with 10.7.2
I've been through these forums for the past week, and while I recognise my problem in other posts, I haven't been able to fix it. I have a 2011 MBP and had no problems until I updated to 10.7.2. I have no Internet at home and only connect at my public library. It's not the router--non Mac computers can connect, as well as phones and iPads. I'm on my iPhone right now, in fact. I've asked a few other Mac users, and the ones who updated Lion are all having problems. My MBP can read all wi-fi hotspots. I am connected with full bars. But the authorisation window that allows you to sign in is stuck in load.
The people who work IT at the library have no experience with Macs. I talked a librarian into letting me connect my laptop to their Ethernet, and my Dropbox synced, but pages still wouldn't load. Something is definitely wrong on my software side. There's something, like a firewall?, blocking my applications from connecting to the wi-fi. I use Chrome, and when I tried to launch Safari for testing, it wouldn't, and I had to force quit. iTunes won't connect either.
Things I have tried: restarting, reordering network preferences, deleting keychains, setting IPv6 to link-local, adding 8.8.8.8 as a DNS, reseting PRAM and SMC, repairing disk permissions, and a lot of other fixes, which I'm forgetting now, that seemed to work for other people on this forum. I've looked, but none of the system configuration files it's been suggested to delete are on my computer. I don't even have system configuration film in library/preferences, so maybe that's a problem?
Any help is truly appreciated.
MacBook Pro, Mac OS X (10.7.2), 2.4 GHz Intel Core 2 Duo, 4GB RAM