Vista - Problems with my Home Network; please help

Lately I finished to build my computer:
Asus M2N32-SLI deluxe
AMD Athlon 64x2 Dual Core Processor
Memory OCZ, 4x2Mb, total 8 Mb
Video EVGA GForce 7600 SLI
OS Vista 64 bit
Thanks to Forum information, I loaded 64 successfully first time (memory = 2Mb only , and “C” Hard Drive only )
As a new in 64 there will be number of problems, but the first one is my Home Network.
Before 64, in my Home Network I was using computers:
ONE, Vista 32
TWO, Vista 32
THREE, Vista 32
FOUR XP 32
There was no problem to see all computers and share files between them.
Now new computer FIVE Vista 64 came to Home Network.
I see all computers in my Home Network but I cannot open any computers ONE, TWO, and THREE (with Vista 32) from FIVE as well cannot open FIVE from ONE, TWO and THREE. (I am looking for share created files.)
Computers ask me for “User Name” and “Password”. So far I never created User Names and Password for any of my computers.
Will appreciate comments for my problem.
Best regards, stasioau

Did you turn off password protected sharing in the networking and sharing center ?

Thanks Sid
As I mention I never protected file by password. Can you please tell me where I can find those passwords if any?
Regards
Stan

Yes, I find it and turn OFF. Same story, can not open other computer.
Stan

Hi Stan, I understand that you did not protected your files by a password and that your user accounts are not protected either, but did you have a look at the networking and sharing center (main window) if the password protection is deactivated?

Yes I did. Passwords are deactivated.
Still can not open Computer with Vista 32. Can open computer with XP.
regards

Sid,
Thanks so much. As with your advice I go to Start-->Network-->"Network and Sharing Center". On this window I did OFF for "Password protected sharing", correct name of my Home Network. From this page -->"Customize" and change from "Public" to "Privete". And I did it for every computer.
Please accept all my best.
Stan
PS Problems is solved.

Hi stan,
Glad you sorted it out,
All the best.