[Solved] [DONT USE WIN XP] FFMpeg && Windows XP, manual install required

Earlier today I faced some problem with Jdownloader, it wouldn't start and said there was some update issue. I uninstalled it and then reinstalled it again. However when I am trying to download some video, it says that the Jdownloader is missing the FFmpeg component. I clicked the button to install it, but it merely says that the latest version has been installed, and nothing happens afterwards. What should I do?
I am using Windows environment, if that helps.