It sounds like your hard drive is failing. This is a good replacement hard drive for your PC: [https://www.amazon.com/Blue-Cache-Desktop-Drive-WD10EZEX/dp/B0088PUEPK/ref=sr_1_2?s=pc&ie=UTF8&qid=1550949695&sr=1-2&keywords=wd+1tb&refinements=p_n_feature_keywords_three_browse-bin%3A4990426011|https://www.amazon.com/Blue-Cache-Desktop-Drive-WD10EZEX/dp/B0088PUEPK/ref=sr_1_2?s=pc&ie=UTF8&qid=1550949695&sr=1-2&keywords=wd+1tb&refinements=p_n_feature_keywords_three_browse-bin%3A4990426011]
Note: After replacing the hard drive, you will have to reinstall Windows. Feel free to ask me how to do that.