Water in bottom of dish washer

you probably have something stopping the drain pump operating (like a tooth-pick or piece of plastic that won't break down in water) its a take it to pieces job i'm afraid but if you are fairly mechanically adept you can do it yourself. the drain pump is quite small and nearby to the drain outlet- you need to remove the case and release the drain from inside the unit- remove the pump itself and you'll prbably find somthing stuck in it- remove and re-assemble. In the meantime DO NOT use the dishwasher as you will 'burn out' the motor as the pump rotors are jammed.
Hope this helps