My computer is running very. My computer is running very slow. So I ran test of my Maxtor 6Y160M0

Question

My computer is running very slow. So I ran test of my Maxtor 6Y160M0 hard drive using the computer's "PC-Doctor" software. The 'linear' test failed, giving me an error code the instructions said I should give to a technician. The code was 2811-201. When I reviewed the Log File from the test, I found an entry stating "Error reading block number 257199000 (of 320159385): Data error (cyclic redundancy check). What should I do?