Re: Under Cabinet Lighting
From what you are describing you have low voltage lighting.
Removing them may be simple enough though it's difficult to say from here over the internet.
The cord you are referring to may be wired to a transformer somewhere behind , below, or on top of the cabinets which would have to be connected someway to electrical power. If the transformer is simply plugged into an outlet it would be very simple to remove the lights ... simply unplug the transformer from the outlet then remove the lights from the cabinets.
If the transformer is hard wired to power and you are not familiar with electrical wiring it may be in your best interest having someone more knowledgeable do it for you.