CPU useage 50% or greater after today's update

Has anyone else noticed a CPU useage increase after installing the latest version - 3.5.57173, 439?

My PC has shown this immediately after launching any app (firefox, email client etc) and continues at a steady level, never dropping below 50%, even with apps closed and nothing running.

If this is a problem, what’s the cure?

Intel P4 2.4GHz
2.0Gb RAM

Reinstalled Comodo with latest downloaded version 3.5.55810.432
and that seems to have cured the problem brought about by just updating the original install.
CPU useage now down to ‘normal’.

Almost the same specs as you but without the problem.