Linksys Wireless Router :: E2000 Reset - Unable To Connect?

So, I've been having problems with connecting my HTPC to the E2000. I had an old D-link router + USB Wireless N adapter, but after the Dlink died, I bought the E2000, and upgraded to a faster N Adapter. Anyway, connection had been sketchy using the WPA/WPA2 encryption. I turned it off completely, and did get some better wireless speeds. I couldn't leave it open, though, as there are tons of laptops around my apartment that end up connecting to my network. Connecting wirelessly using that particular adapter continued to give problems. Two blackberries plus a Nookcolor connect with no issues (maybe because they're wireless G, who knows).

I then decided to reset the router by simply pressing and holding the reset button as I've done on all my other routers. It did reset, and reboot, but when it came back on, it would no longer connect to the internet. I've connected directly to my modem, and that works fine, but once I connect to the router...nothing. I did a hard reset (30/30/30), and that cleared everything, it seemed. The HTPC now connects easily, but there is still no internet connection. This is proving to be very frustrating.
 
Is there something I could have done wrong by doing that very first reset? Is there anyway to configure to get back my internet connection?