@ phebe
yes I had same issue with that too .. couldnt connect to Internet - the previous night the first message flashed up about McAfee Update Launcher has stopped working. Next morning on starting up computer, could no longer connect to internet I ended up contacting our ISP provider who was able to advise on couple of aspects of settings, commenting that it appeared to be with our security program. I think her help was a bit outside of the level support they were supposed to provide, but it only took a couple of moments (after finally getting through) including a 'ping' test and a restart of computer.
But now if you check out McAfee's home page, it does now acknowledge some glitch that was in a recent update and offers a link to follow, if that is of any use.
For me, between my ISP provider and the using the MVT, the issues got resolved and all back up working again.
best wishes