All too often, we either accidentally check yes to install a program or even install a program on purpose, only to have it start at every logon. This can be a waste of resources and in one case caused me numerous headaches. One time, I initiated a wsus offline install of updates. It did the installs but then began to start at each start-up causing a reboot, it would go through this loop and not stop. I ended up having to manually stop the process on each boot up. As you can see, this can be quite annoying.