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The network includes two PC's (Windows XP-wired) and a Mac (wireless). All three can access the internet and all are visible on the network. Until recently files could be copied from any computer to any other. Then suddenly, files one of the Windows computers ("G") became inaccessible from either of the other computers ("P" and "Mac").
If I try to open a folder from the Mac, the error is "The operation can't be completed because the original item XYZ can't be found." The error from Computer P is "XYZ is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions."
I have checked that file sharing is turned on, and even turned off sharing for the relevant folders on Computer G and then turned it back on again. I uninstalled the firewall (Comodo) and that didn't do it. I also temporarily disabled the Windows firewall. I also made sure that the Guest account was active on Computer G. I even set up a different user and tried to access the files as that user, but always got the same error messages.
Any other suggestions would be appreciated.
Edit: Moved topic from XP to the more appropriate forum. ~ Animal
are the xp machines pro or home?
did you change anything, like computer name or domain/work group?
have you tried rebooting all the computers?
can you try - from the run command - the IP address of one of the computers, like '\\192.168.1.102' and does anything come up, or '192.168.1.102\c$' - minus the quotes in both examples.