BOINC can be run as a Windows service. This requires the command-line interface (CLI) version of the core client, which is not available for download; you'll have to build it from the source code using Visual Studio .Net.

If you haven't already run BOINC on the machine, you'll need to run through the setup procedure (using either the CLI or the GUI client) in order to establish the account* files which are needed for the project URLs and authenticators.

Then put the CLI executable (boinc_cli.exe) into the BOINC folder. Type this from the commandline: 

boinc_cli -install
This will setup BOINC as a Windows service which can be started on boot and will be hidden from view. If you are executing this on a Windows 2003 machine the default user account that is chosen is 'Network Service' which means you'll need to grant Read/Write/Execute/Delete permissions to the client folder and all of its children before attempting to start the service. On Windows XP and older systems the client currently sets itself up as local system.

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