It appears that you have inadvertently installed QuickDraw GX, which in turn disables all non-QuickDraw GX printers. If you use the Extensions Manager to disable the GX printer driver, the Chooser will be empty. Installing QuickDraw GX improperly may cause Type 1 Errors in the Finder.
Please follow the instructions from the Tech Info Library article titled "QuickDraw GX: How to Remove".
The QuickDraw GX 1.1.5 Installer is located in the "Software Installers" folder on the Mac OS 7.6 CD-ROM.
This article appeared in the 3 March 1997 issue of the Information Alley.