For anyone else experiencing this same problem, there is now a fix to the ADS.DLL database interface file, downloadable from the Service Pack page on the Softrak website. Here is a link - look for ADS as the program (at the very top of the product list):

End User download service packs web page

As mentioned earlier in the thread, the ADS.DLL file belongs in the \softrak\system folder, on the drive where your Adagio programs are installed. This file is specifically to replace the one dated Sept 9, 2006 where problems exist on Windows 98 machines.