The easiest solution is to just ignore it. Go into your Windows Update control panel, right-click the faulty update, and select “Hide Update”. (If Microsoft fixes the issue that’s making it fail to install, it’ll be redistributed as a new update, and should apply correctly at that point.)
Other than that, there’s not much help I can offer without at least knowing why the update didn’t apply. Windows Update always gives an error number-- do you have it handy?