The 100% cpu is the rootkit scan kicking in 30 minutes after system launch, there is no way to edit this, stop this, or prevent it, some systems get sucked into the voild others bounce along with no impact.
Previous version allowed deactivation of the automatic rootkit scanning subroutinues, 2010 prvents their deactivation, and some systems take a massive hit.
Kaspersky are a ware of the issue, and it will not be hotfixed, it will require a major version update.
If you wish confirmation of this, start a thread on the Kaspersky forums, follow all tehir instructions whilst they blame everythign else on your system before finally settling for the rootkit issue after making you jump through hoops for days. Helpful lot. If you actually want assistance try to contatc Lisa directy at Kaspersky Uk support, and she will prove most helpful if you can get her.