It appears the conflict is with Zone Alarm, sometimes it happens quickly and at other times the browser runs for a while. All my testing was with Firefox as that one seems to stop loading more quickly than IE7. In Safe Mode with Networking I ran for almost an hour with nothing added, then I opened Zone Alarm and after 5 minutes the browser stopped loading. I immediately shut down Zone Alarm and the pages started loading again. So then I opened Spy Bot and Avast without problems. After about 20 minutes I opened Zone Alarm again and this time the Browser worked for 1 hour and 40 minutes before loading stopped. Again I immediately shut down Zone Alarm and loading continued.
After rebooting into normal mode with everything running I opened Firefox and it worked fine for over 2 hours. When the pages stopped loading I shut down Zone Alarm, and this time the pages did not start loading again until I closed and the reopened the browser. After the pages were reloaded, it hardly ran a minute until loading stopped and I immediately shutdown Zone Alarm and loading resumed. It seems that Zone Alarm has to be shut off quickly or the loading will not resume without closing and reopening the browser. And if it is a long period of time the browser will not reopen.
At that point IE7 will open with Zone Alarm running and at times run for several hours before the loading stops.
I looked at some of the fixes on the Zone Alarm site but most of that was pretty basic stuff that I have already tried. I am open to suggestions.