"Enter Network Password" pop-up won't stop appearing, how do you stop this?? Outlook 2007 checking aol account.

OK, I know that this question has been asked before here and other places but I have tried many things and still cannot get it to stop.

I am using Outlook 2007 to access my aol email account. Up until recently it has been working fine with none or very few problems. All of a sudden this week, the "Enter Network Password" window keeps chronically popping up with all the fields populated already, but you have to click ok to make it go away. This would happen once in a blue moon in the past, maybe once every 3 weeks to a month and then not happen again for a while. But as of this week, it is happening about once every 5 minutes to an hour all day every day. (Happened twice since I started typing this so far.) To say that this is incredibly annoying doesn't even begin to describe it! To further annoy me, I have a rule set up in Outlook where certain emails get forwarded to my work address while I'm not home, and when this box pops up here at home while I'm at work, nothing gets forwarded, nothing happens anywhere since I'm not there to click ok on the darn box!

OK, to cut to the chase, I have Windows XP here with Outlook 2007, and I have it checking my aol email. All settings have been checked and tested and are the exact same as when it was running fine. Some other things that may help to know, I have McAfee Antivirus on the computer and a Belkin F5D8235-4 N+ Wireless Router. I've had the McAfee AV for many years with no problems and I have had the router hooked up since November 2009 with no problems up until now that is.

Here's what I have tried so far, all have failed to help at all: (I figured I would tell you what already has been attempted and did not work so we don't waste time on them.)

1. Created a new Outlook profile. Did not stop the pop-ups.
2. Ran Outlook in safe mode so non-Microsoft services wouldn't run. Did not stop the pop-ups.
3. Backed up registry and removed user account information from the "Protected Storage System Provider" subkey, then re-entered password options. Did not stop pop-ups.
4. Disabled email protection in McAfee. Did not stop pop-ups. (Just got another one! Ugh.)
5. Rebooted/Restarted router. Did not stop pop-ups.

I'm currently at the "I got nothin'" point as to what should be tried next.

Does anyone have any idea what it can be aside from what I've already tried?

I am totally at wit's end here and it's driving me crazy. Anyone have some ideas??

Jim.