Are you running those games directly in Windows 95? In that case you should quit Windows and restart in Dos-Mode, for which you don't need any soundcard drivers I think as you have the Adlib card. But you might need to have a CD-Rom driver being loaded at computer startup for some games as Dos doesn't natively support CD drives like Windows 95 and newer do.
As for Adlib in games, yes you would need to open the computer and install a different soundcard if you want to hear digital sounds and better music also. Adlib only has an OPL2 processing of music which might be even not in Stereo if I remember correctly. Besides it's really ancient and might be slowing down the rest of the hardware.
A good soundcard is a Sounblaster 16 which can play digital sounds in CD quality (44010 Khz) and has an OPL3 processing. Soundblaster Pro would do too, but can only play digital sound effects up to 22050 Khz though in Stereo. Not recommended are Soundblaster Awe32 (it's drivers take up too much conventional memory and you need as much as possible for most Dos games), Soundblaster 16 Vibra (later, cutdown model of Soundblaster 16) and any PCI soundcard since Dos wouldn't recognize the IRQ adress on such cards which would lead to problems. Only an ISA card will do. Those digital sound cards need drivers to work in Dos properly, too.
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