As you may have seen in my youtube comment Britec09, I recommend this idea for a video, here's the story: I was looking for a way to free space from my hard drive and I found that there were a lot of unused .msi files in the windows/installer folder, then I found online this discontinued by Microsoft tool called Windows Installer Cleanup Tool and there were a lot of comments about it saying that it may ruin some applications if you delete some .msi files, so I believe it would be an interesting video to see for you to use this discontinued tool to really check if it is dangerous to use it. The last version made was for windows xp, so I don't know if it would work with windows vista/7/8/8.1 or 10. But it is worth the try... Hope you made this video! 
