This is a repost of my previous post, but cleaned up. This is how to get Windows 7 and XP PCs to see each other's files in a network. The instructions are for the Windows 7 machine. This is a lowest-security approach to increase chances of getting it to work. You can modify it for better security.
Summary:
1) Ownership and Permissions of a folder
2) Sharing the folder
3) "Work" group, not "Home"
4) All PCs in same group
5) Reboot all PCs
6) Last ditch effort
Part 1: get the folder's ownership and permissions right on the Windows 7 machine
1) make sure you own the folder: RtClk-properties-security-advanced-owner-edit (and make yourself the owner)
check "replace owner of subcontainers" to apply to all files and subfolders
2) "OK" the above to set everything and get out, then go back in to give "everyone" read/write permissions. Delete all the others like administrator which someone above said might cause a conflict:
a) RtClk-properties-security-advanced-permissions-change-permissions (if everyone is not in the list, click "add" and type "everyone" in the big box - "OK").
b) "Remove" all others, but remember how to use "add" as in a) above to get them back if necessary.
c) "Edit" "everyone" and give them all permissions.
d) uncheck "inherit parent permissions" to make sure it doesn't override what you want
e) check "replace child permissions" to apply to all files and subfolders
3) "OK" the above to get out and then go back in:
RtClk-properties-security. If "everyone" is not the only one listed or does not have all permissions, fix with "edit".
Part 2: Share the folder.
RtClk-properties-sharing. In both "share..." and "advanced sharing...->permissions" make sure "everyone" had read and write. Remove any others.
Part 3: Networking with XP: All XP and 7 PCs should be a "work" group and not a "home" or "public" group. "Home" is only if all computers are Windows 7.
1) Control Panel-network&sharing: under the bold name of your group is an underlined link someone took a pic of above: change it to "work" instead of "home" or "public".
2) Control Panel-network&sharing-ChangeAdvancedSharing set all the obvious settings there.
3) Control Panel-network&sharing-Firewall (I turned it off for now)
4) Control Panel-network&sharing-SetupNewConnection (this function is not completing for me)
Part 4: Have One Group Name. All machines have to be in the same group. To change the group name on XP or 7:
Control Panel-system-advanced-computer name-change
Part 5: Reboot all PCs. If letting the windows 7 Machines be the last ones to boot doesn't work, try letting the XP machines be last.
Part 6: Last Ditch Effort. See if the PCs can at least see each other. On an XP or win7 PC, find its IP address. Click start menu-programs-accessories-command prompt-type "ipconfig" and hit enter. Write down the IP address. Go to the other XP or win7 PC and click start menu (then click "run" in XP) and type \\[IP address you wrote down] and hit enter and you should see all shared folders on the other PC. With my linksys router, it's \\192.168.1.10x where "x" is a number from 1 to 5 identifying the various PCs in the house (assigned by the router starting with 1 in the order they are booted up).
Finished
The "work group" name should probably not be "home" as I did, which seeemed to cause problems.
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