Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
What is the make and model number of the laptop?What operating system is running on it?Approximately how old is the laptop?Does the CPU show high usage as soon as you boot it up, or only after you start some applications?What application is showing as using the most CPU usage? Can you attach a screenshot of CPU usage?