If you do decide to do a reinstall beware that you will lose everything you have on your PC that you don't have on an exterior drive (unless your drive is partitioned) or on a site such as Dropbox - Some people don't always realise this does mean all your documents, saved emails, photographs, passwords, browser history, on that PC, you will end up with the PC as it was when new - Remember any software that required a key etc. will be gone make sure everything you need is on at least one external drive & you have all software keys you may need to reinstall software & the discs.
Sorry to go on about this & I’m not trying to be patronising but I've seen so many people who haven’t thoroughly checked that everything is backed up & lost some very important documents or often sadly photographs etc, & if your PC is working OK now leaving well alone may be an option? - Paul