Windows ME is looking to be rather problematic.
keyplayer,
You mention that you are using the nVidia 4.11 driver and even indicate that it is the "old" driver. I think most, if not all, of your problems with the Aquarium would disappear if you upgraded to a newer driver. The Aquarium has been tested to run on recent drivers only.
You can get the proper drivers for your system by visiting the Help section at
www.feldoncentral.com/Sachs/help.html
The technical support available to Sachs Aquarium users is robust. You can e-mail
Service@serenescreen.com and usually get a reply the same day. Or you can post here to the Forum, to the Chat, or e-mail me directly.
If you do go through with the refund, I'll be sorry to see you go.