It seems like you encountered an issue while trying to install the Microsoft update "KB2286198" due to ESET Smart Security blocking it. Disabling the "Realtime Filesystem Protection" feature allowed you to successfully install the update.
If this issue persists or becomes a recurring problem with ESET Smart Security blocking important updates, it could be frustrating. In such cases, it might be worth considering alternative security solutions that do not interfere with the installation of Windows updates.
If you need assistance with finding alternative security solutions or resolving any further issues, feel free to ask!