OE Password issue

I had to reinstall Win XP on one partition of my dual boot set-up and set-up Outlook Express. However, whenever I try to manually get any e-mail, I get the following:

First: The logon Screen with my username and password I set up anew. Ehen
Press "OK", the screen goes away then repeats indefinitely.

Second: Error message-
"There was a problem logging onto your mail server. Your Password was
rejected. Account: 'pop-server.twmi.rr.com', Server:
'pop-server.twmi.rr.com', Protocol: POP3, Server Response: '-ERR
Authorization failed', Port: 110, Secure(SSL): No, Server Error:
0x800CCC90, Error Number: 0x800CCC92"

I assumed that the password was incorrect. I didn't remember the original password, which is on the other OS (unreadable), but OE works here.

I uninstalled OE completely and repeated installation anew.

I assume that the original password is installed on the computer, but is coded. Any way to reset or get original password"

Any ideas?