Cam, I might have come across an answer for you. This is taken from PC Advisor magazine:
Q. "For some reason my computer won't remember my password for my ISP. Before, when I clicked on the icon, my computer would automatically dial up and connect. Now it asks for my password every time, and the 'Remember password' option is grayed out."
A. "It sounds as if a key in your registry has become corrupted. You can easily put things back to normal, but be aware that amending the registry settings can have serious consequences if you are not careful. Before starting this fix, you should back up the registry, so you can put things back the way they were if necessary.
Do this by going to Start > Run, type regedit and click OK. Go to File > Export, and choose to save the back up on your desktop. Once this has happened, navigate through the registry explorer tree to:
HKey_Local_Machine\Software\Microsoft\Windows\CurrentVersion\Network\Real Mode Net
If you see the autologon (on the right hand side) with a value of 00, double click on it and replace the value with 01 00 00 00 00.
Now restart your computer, and you should be able to save your dial up password."
As I said, the above was lifted straight from a magazine article. I can't guarantee it's success, but I thought it might be worth a try for you.