yip yous were right and that is the correct update for windows 7 "security update for windows (KB2803821)" is how it will show in view installed updates in Programs and Features and just uninstall and problem solved if you don't have sensitive data on you computer you can hide the update in windows update this is the link from windows update if you want to look at it.
https://technet.microsoft.com/en-us/security/bulletin/ms13-057