Hello Terri Burnside,
Welcome to Microsoft Q&A forum.
Before we proceed, may I know if there are any important data that you would like to keep? Since you have lost the account and it have been a year since you last used your computer, I'd say the files and apps is no longer needed and I'd suggest you perform a clean install of your computer to wipe the hacked account off the computer.
Please let me know your choice and we will proceed accordingly.