----------------------------------------------------------- w i n d o w s 9 8 d e f a u l t i n s t a l l a t i o n d i r e c t o r y ----------------------------------------------------------- Summary To change the default directory that Windows 98 uses to install new software. Solution: Edit the following key in the Registry. Normal precautions apply; remember to back-up your registry BEFORE editing it. HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/Current Version/ ProgramFilesDir and CommonFilesDir Source: unknown.