Outlook 2007 no mail in inbox

Running Windows 7 64-bit, Office 2007 Enterprise Edition. Setting up comcast
e-mail in Outlook 2007. All settings are correct. Have
uninstalled/reinstalled/repaired Office/Outlook. I save the password on the
setup tab, but when I test connections, it asks for the password again on the
POP3 and SMTP server test. And when I send myself a test e-mail, it asks
again for the password, even though its saved. However, no e-mails are
showing up in the inbox in Outlook, even though they're in the sent folder
and they show up on comcast.net. I am totally stumped here. I have the same
version of Windows and Office on another computer, same exact settings for
Outlook, and even added this other mailbox to the other computer and it works
perfectly. So why doesn't it work on this other computer? I don't get it.