Just a reminder that Windows 7 extended support ends January 2020. Micro$oft will not make software updates after that date. It will quickly accumulate security holes and every bad guy will be targeting it.
Take inventory and budget for it.
If it’s a personal Workstation your options are; Upgrade to a newer version of Windows, which will cost about $100, or replace that computer with something from this decade for a few hundred $, or you could install Linux Mint for free. This is a good option if you just use the PC for browsing the internet and Email. Mint feels very similar to Windows, Chrome and Firefox both work well.
Download here https://linuxmint.com/download.php The site has good documentation on how to Upgrade.