Two possible ways:
- Make more users (one for each windows user).
- Make the resource public (with public = Yes or guest ok = Yes) in /etc/samba/smb.conf
There's no sense in putting only a user and only one id to connect. This is a security hole anyway.
If you find it dificult or too much work to do it, try with group policies to manage security. But the only way to have the system secure is managing user accounts.
Another option is to put an automatic unlock script in cron, and let's say, every two days, failed tries will be reset (although the limit was not reached).
Hope it helps.
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