Dell inspiration 3542 hard drive issue

Hi 

Problem:

Dell inspiration 3542 intermittently freezes.

Diagnose & Attempts to fix

run F12 diagnostic tool, failed on hard drive  test.

run chkdsk, it may fix a few days/weeks, then issue came back

event viewer showing large number of disk errors

 Question:

Do you think I shall replace hard drive or run some other repair tools ?

If so,

1. what are recommended steps?

2. how to keep windows 10 without having buy a new license?

Your kind help will be highly appreciated

Regards

Peter