hmm, sorry to hear you are having troubles with BOINC again. First, try installing the latest version of BOINC if you haven't already: http://boinc.berkeley.edu/download.php

It looks to me like the CPU usage is going up and down very consistently. To me that would suggest that the CPU usage is turned down in BOINC. You can get to the CPU usage tab by going to the preferences under the tools menu. I have attached a picture of my prefs so you can see where it is located.

Let me know if you have any luck,

adict