Software :: Ubuntu 9.10 - Temp Reaches Around 80 To 90 Degrees

I am using ubuntu karmic kola 9.10. The problem I have been having lately is of overheating of my intel core2duo proc, where the temp reaches around 80-90 degrees and the cpu shuts down after a while and the message from the bios is of thermal trip. Ideally my cpus temp is around 55 deg,the moment when the temp starts to climb and when I run a top command, I see arpwatch taking 100 % of cpu. After googling I came across this.

Code:
[URL]. How can a process which is taking 100 % cpu cause a system to over heat and shutdown in few mins? I have had seen instances where processes taking a lot of cpu but not something like this.

ryan@wsx04:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=9.10
DISTRIB_CODENAME=karmic
DISTRIB_DESCRIPTION="Ubuntu 9.10"

Code:
ryan@wsx04:~$ dpkg -s arpwatch
Package: arpwatch
Status: install ok installed
Priority: optional
Section: admin
Installed-Size: 468
Maintainer: Ubuntu MOTU Developers <ubuntu-motu@lists.ubuntu.com>
Architecture: amd64
Version: 2.1a13-2.1

Code:
ryan@wsx04:~$ sa | grep -i arpwatch
4 292.10re 2.06cp 0avio 5176k arpwatch*