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Try to find out why an employee doesn't have an interest in improving performance.
If the employee lacks confidence or has become bored with the work, you can often salvage the employee. To deal with a lack of confidence create a plethora of opportunities for the employee to succeed. Each success will build confidence. For the bored employee, add some variety to his work.
If the employee's attitude toward the company is poor or if he has simply lost interest in the work, you're probably going to have to help him find other employment.
One of the biggest mistakes you can make is spending a lot of time with people who aren't interested in improving their skills or performance. It's the ones who are interested who deserve your time and energy.