If you're risky guy you can just change your passwords and call it a day since I'm about 75% sure the virus didn't hide itself in the system and just performed single steal, however to be certain you're safe it's best to reinstall windows with full format.
If you don't want to lose any of your files you can choose middleground and install windows on top of your old windows, it is an option in installer so none of your files will be gone. However it depends on when was the last time you reinstalled OS, it is recommended to do it somewhat regularly anyway to keep it clean and performant