I just found a way that solved the issue. Downloaded DgWoodoo and copied necessary files where they were needed.

By the way, to answer your questions, 8 bit color mode didn't fix it, deleting or editing jazz2.cfg didn't seem to work, uninstalling and reinstalling didn't work, because my PC "remembered" the setup for the game, so rather than resetting the game, it simply continued where left off despite as far as game settings are concerned, despite actually resetting everything else (save files, level progress etc).

Thanks for the reply, I appreciate the help