hi guys, i have an origonal model xbox not sure whitch version exactly

but quite an earlyish one, i have had an executer 2 mod chip installed and replaced the old hard drive with an 80gig one so i have more space
i had a shop install it all as im useless with this stuff.

i have all this crap on it though like an option for emulaters and stuff which i dont know how to work - i can turn the emulaters on but cannot use them etc wouldnt mind having a snes emulater like which is on my pc (snes9x or similar) etc but not sure how to so this. what i really want to do is install DOS onto the system so that i can then instll windows and use the xbox as a kind of mini pc but i dont know how to do this , has it been done before?? how can i do this ?