Networking Issues

I am running Vista Home Premium on all 3 computers. They are all my network
at home with the same workgroup name. All 3 are able to connect to the
internet through a wireless router. My desktop is hard wired while my 2
laptops are wireless. My problem is that one of the laptops will not access
files on the other 2 computers nor will it allow the other 2 access to it's
shared folders. I have made sure that all the folders have full permissions
on them. Also, I have turned off password protected sharing on all 3
computers, but the 2 that will allow file sharing still force me to type in a
user name and password (which is my logon to each computer) before I am
allowed to. I am severely confused. Any help would be greatly appreciated!
Thanks

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http://windowshelp.microsoft.com/com...orking_sharing