Your version of MySQL wont work with this program: 5.5.14. You should upgrade to MyAQL 4.1
The main server is functioning correctly and any previous workstation installations are connecting to the database without this error - this is only seen in 2 workstations where I did a fresh Win XP install (virus issues)
Consider upgrading to Windows 8, especially if you suffer from virus problems. Win XP will be losing it security updates from Microsoft next month. Windows XP is 21 times more likely to get infected than Windows 8. Windows 7 is only six times more likely than Windows 8 [source: Chris Hallum, Microsoft senior product manager, as reported in TechRadar].
Your XP workstation probably just has an older version of Open Dental installed on it. Try running the Setup.exe for v14.1.7 from your AtoZ images folder on the workstation.
The best thing about a boolean is even if you are wrong, you are only off by a bit.