Hi Katie,
Welcome to Microsoft Q&A.
Resetting your PC wipes out all user information and settings, including user account.
It’s ok to reset as is said on the Microsoft website.
https://support.microsoft.com/en-us/help/17085/windows-8-restore-refresh-reset-pc
When you start up again, just follow the setup steps to log in with your Microsoft account, it has nothing to do with previous accounts.
If the manufacturer's factory pre-installed system is activated, it will also be active after reset, so you don't need to activate it again.
Please remember to mark the reply as answer if it helps.
Best regards,
Molly