I think the Enable/Disable of SFS has caused your problems, and perhaps reset some settings.

It is probably best for you to try and reset your sharing settings, perhaps even re-run the home networking connection wizard in the Network Settings Control panel.

For simplicity, Simple File Sharing is adequate. Ensure the "Allow users change" box is checked, and also check to see if Authenticate as computer is set.

Also, check your firwall settings if you have one installed ie ZA, Norton or even the default winxp firewall. Ensure that file sharing is enabled. Also, in your TCP settings for ethernet adapter, ensure File/Print option is installed and enabled.