Either install BOINC in non-service mode or set the BOINC service startup mode to manual.

Gruß
Gundolf

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Computer sind nicht alles im Leben. (Kleiner Scherz)

Until you're told us a few things about your system, which OS, which Boinc version, if it's Windows, what kind of installation did you do, if it's Linux, then where you got it from, it'll be hard to give you you an answer, hence no replies:

http://boinc.berkeley.edu/dev/forum_thread.php?id=8600

Claggy

The whole point of 'Protection application execution' (aka 'service mode') installation is that it causes BOINC to run 'as a service' - i.e. with any, every, or no user logged in to the console.

If you want to have 'per user' control of BOINC's behaviour, you would need to install it in user mode. Even then, an un-priviledged user account will have difficulty managing settings like this: if that user never wishes BOINC to run when he or she is busy, the surest way would be for an administrator to set

[HKEY_CURRENT_USER\Software\Space Sciences Laboratory, U.C. Berkeley\BOINC Manager]
"DisableAutoStart"=dword:00000001

in the registry for that user account.

Be aware that your CPDN models would never make further progress except when that user logs out and another user logs in.