I recently installed SBC/Yahoo DSL, but apparently it (or Zone Alarm)
has some incompatibilities with Spam Inspector, which I use in
conjunction with Outlook Express.  Spam Inspector used to catch a high
percentage of my spam; now it catches nothing.  Even worse, at times
it starts to eat up a huge percentage of my CPU's duty cycle.  When
that happens and I look in the Task Manager (I'm running Windows XP),
I'll see siSpamFilterEngine.exe running at 20% to 30% and vsmon.exe
running at 60% to 70%.  When I delete the siSpamFilterEngine.exe
process, the vsmon.exe duty cycle drops back down to zero and my
computer starts running normally again.

How do I get Spam Inspector to work properly?  And how do I avoid the
occasional bouts of extreme computer sluggishness?