i would suggest a complete uninstall (delete directories, registry enteries, save games). scandisk, and defrag. update your soundcard drivers, and use all default settings on your graphics card (which one you got?). then reinstall of ff7, use it without any patches, with d3d on if you can (use riva tuner to enable 8bit textures), and see if it helps. if not check that ur graphics card and sound card are on max performance settings, (graphics go to display panel>advanced settings>video adapter tab, check the slider. for sound go to sound panel>go to 3rd tab>advanced audio settings button>performance tab, check the slider).
worst come to worse use a older agp card, or soundcard.