I have two XP Pro machines, A and B, peer-to-peer in workgroup "workgroup". File-sharing is enabled in both, simple file-sharing is not enabled on either. A has had for some time two shared folders, ProSystem and RentRoll, which B accesses without problem.
Today I installed QuickBooks Pro multiuser version on A in folder C:\Program Files\Intuit\QuickBooks Pro, and attempted to share out this folder giving full control access to Everyone. When I try to access this folder from B, I get the message "access denied".
I can ping A from B with no problem, and can still access the ProSystem and RentRoll folders on A from B.
User Pete (no password) has admin rights on A; user Karen (no password) has admin rights on B.