You've upgraded to IE 7 and now FrontPage won't save your userid and password when publishing to remote servers
The fix that worked for me has two parts:
1. Bring up your remote site in IE 7. Then go to Tools > Internet Options > Security > Trusted Sites > Sites and Add your site to the list. Then Close > Apply > OK. You may need to restart IE 7 for this to take effect.
2. In IE 7, Tools > Internet Options > Security > Trusted Sites > Custom Level > User Authentication > Logon > Automatic logon with current Username and password and then OK your way back out.