What is the NTFS permissions set to? (this is under the security tab next to the sharing tab on the properties of the Drive/folder)
The account in this case the "everyone" account need to have local access to the files before that account can have sharing access
If the drive your are talking about it the C drive with the windows folders and stuff, I wouldn't want to give the "Everyone" account access.
If you have the same User names and passwords on each of the computers, I believe you can just give those accounts access and it automatic will log you in to the remote computers. (But those accounts need to have local access to the files your want shared as well as sharing access)
It can be a pain to network with windows7 if you have a apple especially! I had problems connecting my xbox until I updated XBMC, so try updating your xp computers and fallow the link above. If you wan't to connect a mac have fun, it's a pain but is possible, you just need to manually connect to the shared files everytime.
You said all 3 boxes are unchecked with Everyone ( this mean if Everyone is the only one in the list, that no one has access automatically). If you want to make it available for your other PC's you will need to add an account to the list ( for example your own, only risk involved here is that you will have to allow your user's password to travel on the network ).
So you click add, then type your user in it
( if you don't know it press (windowskey)+(R) type "cmd" in the box and then type net user and you will normally get all names of the users on your local computer )
Then check the permissions you want if this account is used to access it.
!!!! IF YOU MADE AN ACCOUNT OR USED A DIFFERANT ONE YOU NEED THE SECURITY SETTINGS TO BE SET RIGHT
If a different account but your own you need to made sure that that account also actually has access to it ( so you will need to add him to the list in the security options of the file )
The other comments where they say to change the password protection is just like taking your Everyone with all boxes almost, the one I gave is more complex but more adjustable and somehow safer.
The comment with having to share the directory above it is not nessecery all, advanced sharing does is makes a link to that specific folder and gives it an address to access ( \\[your pc name]\[name of the shared folder in advanced sharing] )
Did anyone get a solution to this problem? I now exactly the same issue. I have been sharing folders on XP boxes for 7 years or more. Have recently upgrade to W7 64bit and now get permission issues.
I have 4 PCs set up the same. 2 work, two don't. One did but has started not working this week...no updates have been run.
In all cases I am trying access the share folders on macs. Sometimes if I restart the PC then I can access share folders for a limited time then I get blocked.
Really frustrating so any help very much appreciated.