Cool! : )

If it's the 'demo' Zip, it's got some cool loops on it you might like? But, if it's corrupted - try the DISK FORMAT in the menu of SYSTEM/Utility (top middle button). Hopefully that will give you a fresh Zip to use, but you will loose all the 'demo' stuff in the process (not that they would be any good corrupt either?)

The 'sampling aspect' is pretty straight foward on the 808, and laid out pretty logically I think? But from there, YOU WILL NEED THE MANUAL! It gets pretty heady, and there's alot of SHIFT+ button combinations in the 808 and routings just to lengthy to explain here. It's a top notch underated box - but like a Porsche, you need to know how to drive it first.