You might want to take a look at another post via the link shown below. See if the information provided by one of McAfee's tech support staff there is of any help. If not, post back here and let us know.
Every time Google Chrome gets updated to a new version (and that happens regularly) I see the same popup that you do. I click on Always Allow Access and everything's fine until the next update. Don't ask me why this happens, but it's only mildly annoying.
As for Chrome not displaying web pages, check your Chrome settings page in Wrench(aka Spanner)-->Options-->Under The Hood. See below. Your LAN settings should not show any kind of proxy server, so uncheck that box if it's checked.