I'm having one heck of a time getting BOINC to run reliably as a service.

I'm running WinXP pro.  The steps I have used to install are:

1) Run the installer package, deselecting the "Select as default
screensaver" and "run on login" (or whatever that second checkbox says...
this is from memory.)

2) I complete the sign-on with project and user id.  Once my work units have
downloaded I end BOINC.

3) From a command line in the boinc program directory I issue:  boinc_cli
-install.

4) I open windows services and ensure that I have BOINC running as the
system user.

I tried both of the following:

5) start the service and, once it is running, shutdown and reboot the
computer  

or

5) sign-off and, from another machine, remotely administer the machine to
start the service.

When I look back later I find that the service has stopped and in the event
viewer I see where BOINC registered that it received a user signal to quit. 
This is happening on only a couple of my WinXP boxen, the others are
identically configured in both hardware and software.

One other thing, I have attempted using the login "Network Service" with the
boinc service, granting authorities to the BOINC directory and its
contents.  I have the same problem.

Anyone have an ideas where to check next?

TIA,

Barry