Why does my MBP (early 2008/OS X 10.8.4) keep telling me my network password it wrong and won't connect?

When I enter the WPA2 password it tells me it's invalid (it is most definitely not, nor has it been changed). I reset my router and restarted my Mac, I've tied connecting from a new "location" and erasing keychain entries, and network preferences. I deleted the airport preferences file and rebooted. When I go into the advanced settings under TCP/IP there's nothing, no IP address, no gateway, no DNS. Renew DHCP Lease doesn't work and manually inputting the DHCP settings doesn't work either. I have no idea what's wrong. I've tried all the fixes I could find on the Apple Support Communities and Mac Rumors, nothing's worked so far. I'm well out of warranty.
Please help!!

Follow these instructions: How to perform a "clean install" of Flash Player in Mac OS X to the letter. You'lll perform an "offline" install and be up to date.
Adobe updates are released on average about every six weeks, not once a week. In fact, the most often they've been this year was in March when a security issue was addressed and an additional Windows update was released ten days after the regular update, but that wouldn't have affected you on a Mac.

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