Tell BOINC how to log in. BOINC will need a user name and password, it can be an
existing user or you can create a new one. Also uncheck "Make BOINC your default screensaver" and
"Launch BOINC when logging in"
Now complete the isntallation.
BOINC is now installed as a service and will run while any user is logged in. You can
start boincmgr.exe or use BoincView to control boinc.