Solved it. The only thing I had done recently was to install an upgrade for my ZoneAlarm security system. I uninstalled ZoneAlarm completely and booted up in Safe mode with Networking and I had internet connections, both wireless and wired! I rebooted in normal mode and re-installed ZoneAlarm from the website and it's still working just fine.
I can't get any internet connection on my M17x. Wireless or wired, it says Internet Access but can't find any pages when I try to go to Yahoo or such. I've tried restarting it, opening up my home network so it has no security on it temporarily, etc. All other computers in the house are fine (2 laptops and 2 wired desktops). When I try running the troubleshooter, sometimes it says no problems found, other times it says there is a problem with my broadband modem. I don't believe this is true, since the other 4 computers are working fine, but I even tried restarting my modem and my wireless router. Any ideas? Thanks in advance.
Alienware M17x no network connection