Connecting to a share in a network after password change

I have a network of two computers

ComputerA, running Windows XP 32-bit has a shared folder in read-onl
mode called SFiles with a sign-on of CAShare and a password of ZXJK1122

ComputerB, running Windows Vista 64, in the Network entry of Window
Explorer shows ComputerA. When I expand ComputerA I can see the SFile
shared folder undereath and when I try to click on the folder it asks m
for a sign-on and password. I answer with CAShare and ZXJK1122, and i
asks me if I want to save this information and I say yes. Subsequently
when I click on the SFiles shared folder it gives me read-only access t
the files in the shared folder. This works excellently

Subsequently, on ComputerA, I decide to change the password for th
sign-on of CAShare from ZXJK1122 to NPPP345T

Now on ComputerB when I try to click on the SFiles shared folder i
Windows Explorer I get a message of

"Windows can not access \\ComputerA\SFiles with an error code o
Ox80070005, Acces is denied.

That's fair enough, since I changed the password for the sign-on. So
want Windows Explorer to ask me for a new password, and I will repl
NPPP345T and now have read-only access again which is fine. But it doe
not do this but repeatedly denies me access each time I click on th
shared folder. Surely there must be some way to tell Window Explorer t
get a new password from me for this share. How do I do that ? It seem
impossible that Vista will keep me from accessing shared folders o
another computer on my network simply because it has decided that I ca
not change the signon/password to the other computer's shares

--
eldiener