Comp2 reports - Network Password expired?

I once knew everything except that I'd get older and notice that I did not know everything...

Right, 2 boxes both with 2k.

Set it up fine:
Comp A -> Dlink cheapy Router -> Comp B.
Able to share files when my firewalls off (tiny personal firewall).
Which is fine for my needs...Cable modem on stand by..firewalls off.
(sharing printer works with firewall up btw)

Couple weeks later - I go to move many files over to Comp B before
formating Comp A....message on Comp B states that the password has expired?


Networking is not my strong suit as I only just for the first time got a second computer here....
The setup guide I used was generic (as I looked it over) and I believe I got it at DSLReports.com.
I've done DSL tech support in the past and comfortable moving around the
network settings but I See NOWHERE (overlooking it i'm sure)
where I could find/reset a password?!

Any ideas? (and thanks for the help to a silly noob like me)

 

Please give more details on COnnection setup!!!