My laptop had been starting really slowly. It used to take 10 minutes after some point. I thought it was just some windows 10 update that messed it up. So I just lived with it.
But after dealing with that for months, something messed up and it started taking an hour to boot up. Not only that, but it would take 20 seconds for the windows UI to react to anything. A simple task like clicking the start button or using ctrl+alt+delete was a huge struggle.

So I bought new hard drive and backed up all my data. I got windows 10 running on the new hard drive, and my laptop works really well now. I was without it for a week, and boy that week was awful and depressing. But I'm glad to be back.