10.7.3 Combo Updated and still no internet connectivity, 15" Early '11 MBP, Wi-Fi or ethernet

Question

Early 2011 15" MacBook Pro, 2.2Ghz i7, 8GB RAM
I downloaded the 10.7.3 delta update on Saturday and installed it without issues. As soon as I started using it I was unable to connect to any internet conenction within OS X. Wi-Fi, Ethernet, nothing can connect to the internet, although I can connect to the router.
I am able to connect to the internet using my Boot Camp Windows 7 partition, as well as through the Lion Recovery Disk's Safari Browser.
I was able to download the 10.7.3 combo update as the hopeful solution to my problems using Windows 7.
However, after installing it I am in no better position and my 10.7.3 install still has no access whatsoever to the internet.
Looking for an urgent fix, and have tried most of the various forum suggestions (checking/unchecking settings, etc.) - all to no avail.
Please help.

Answer 1

I've been on 10.7.1 thru 10.7.3 and am still suffering from connectivity issues (brand new MBA running Lion). If you search using the keywords Lion Wifi Problems (or something to that effect) a lot pops up...one thread has almost 200k views and the other's got over 45k (other threads have a few hundred or a few thousand), just in the Apple Support area alone, ignoring the bloggers that have also raised this issue.
The issue doesn't affect everyone running Lion, or all of a particular type of machine, but there are enough reports of Lion on different machines (upgrades to older machines, and pre-installed brand new ones, desktops and notebooks), using different routers, in different countries, etc., to show that this is a statistically significant problem, and that there's most certainly a bug in the OS. There are people running PCs and older OS versions and iOS on the same network, and the only thing with the problem is the machine running Lion. Unforunately, Apple has not officially acknowledged this problem, so for those of us who've tried everything and run out of options, we're stuck with what we've got - an expensive machine that can rarely/barely connect to the internet.
There are some temporary fixes like logging out and logging back in (sometimes after logging into a different account), renewing the DHCP lease in network preferences, turning the router off and on again, reinstalling the OS, deleting all the remembered networks and passwords, deleting the preference file and letting it rebuild, changing the order of services in network preferences (e.g. so WiFi comes before Bluetooth), setting up a continuous ping so the network doesn't disconnect because there's no data transfer, etc., etc. For some people, this miraculously works, but for most, it's a quick fix or doesn't help at all.
10.7.3 was supposed to address part of the issue (not finding a network when waking from sleep), but unfortunately hasn't for most people. I'm starting to think the only way this will get fixed is if people kick up enough of a fuss to mainstream media that they start to take notice and report on this. I would think that this is far worse a problem than the antenna issue, because these machines are more expensive, and lose connectivity regardless of how we hold them or where we take them. This is particularly frustrating for those of us who own machines that have no ethernet port, or are in places where the only option is WiFi.
Best of luck with resolving this. Hopefully Apple will fix things soon!