Okay slow down there man. GiriGiri should work on your PC, I get the same DirectSound message, and it works fine. First off, what game are you trying to run? What country is it from? USA, Japan, Europe? Use the right BIOS according to the region of the game. Next, your game must be in bin+cue format to work with GiriGiri. If it is, simply run the GIRITOOL.EXE program that GiriGiri came with. Now your game must be in the same folder as GiriGiri to work this thing. What you do is select the bin file of the game in the first dialog box, then in the second dialog box, select the country of origin. You still following this? Now push the button that says "Run Gentoc". Then push the button with the Saturn logo on it. It should run now. You might have to fiddle with some button configuration for a joypad or your keyboard, but that's pretty simple so I won't go into it. Just run the GLaunch.exe for all that and the screen resolution.
