BOINC (previously SETI@home) program is a particular screensaver. Like all the other screensavers, it starts when you do not use your computer and it stops as soon as you resume your work. But what it does during the interim is rather unique. Whereas you will have a cup of coffee, or lunch or will sleep, your computer will help in the Search for Extraterrestrial Intelligence by analyzing the data especially collected by the largest worldwide telescope radio.
BOINC is compatible with Windows 7, Windows 8, Windows 10. The access to the computer can be protected by a classic configured password in the configuration panel (it should be avoided if you do not have at least 64 Mo of RAM and a powerful machine).