Windows Mail Passwords Not Storing

I have had my computer almost a year, no Windows Mail issues til now. I have Vista Home Premium. I went to check mail today on Windows Mail and all of my passwords would not store any longer. I get a windows security pop up for each account to put in the logon info, I do, click store info, ok. I put them back in, checked mail ok, but when I closed Windows Mail and restarted it, same problems. When I put the passwords in the Accounts section and hit APPLY, they disappear again once I reopen it. I have deleted the accounts and put them back in, same problems. I check 6 accounts at once too, so it is a major pain in the butt to input every one each time like this. It is not my antivirus program either, I have used the same one for a year with no problems until today. This morning it all worked fine, now it the passwords will not save.