Switches off my computer while scanning

[keirn falln]

Hello Im new here.
I am a total novice to computing
I run Norten Anti Virus with its associated spyware and firewall etc.

Ive down-loaded your spyware on advice from a friend, as lately I have some strange things happening on my PC that nortan does not seem to be picking up.

My problem is that I've downloaded your software and on running the Scan my computer switches itself off after a few minutes of doing your scan.
I've tried three times now and it does it every time!

Any Ideas Tnankyou

[md usa spybot fan]

Spybot is quite CPU intensive. It is possible that the CPU overheating and the system is shutting down to protect the processor.

Skeptical? If you doubt that this can be the cause of a shutdown during a Spybot scan and other CPU intensive scans, read the following:
Spybot causes shut down (Solution - Blew out heat sink)
http://forums.spybot.info/showthread.php?t=2163
PC crashes while Spybot is running (Solution - Blew out heat sink)
http://forums.spybot.info/showthread.php?t=2230
Spybot wont run (Solution – Vacuumed the fan ["hovering the fan" actually])
http://forums.spybot.info/showthread.php?t=2685
spybot related shutdown (Solution – Member did not specify the corrective action taken, but did comment: "Success!!!! Yes!!! It worked. Thats amazing.")
http://forums.spybot.info/showthread.php?t=3796
spybot shuts down computer while scanning (Solution – Fixed loose heat sink)
http://forums.spybot.info/showthread.php?t=4582
Suggestions:
Make sure that the fans are running and that dust is cleared from any ventilation ports in the case.
For desktops (See Caution! below):
Consider opening the case and checking to make sure the CPU heat sink is not dusty or loose. There is a tutorial on cleaning desktop computers here:
Cleaning the Interior of your PC
http://www.bleepingcomputer.com/tutorials/tutorial118.html
For laptops (See Caution! below):
If your owner's manual tells you how to open the case (IBM ThinkPads and Dell Inspirons generally do), consider opening the case and checking to make sure the CPU heat sink is not dusty.
If you have a laptop with one of the one of the following processors:
Mobile Pentium III-M
Mobile Pentium 4-M
Mobile Pentium 4
Mobile Pentium M / Centrino
Mobile AMD
Take a look at following suggestion by 100mill (http://forums.spybot.info/member.php?u=2965):
Notebook CPU running hot during Spybot scan
http://forums.spybot.info/showthread.php?t=1816
Caution!
Before open the case on any PC make sure that you read the owner's manual for that specific PC. This is extremely important not only for your well being due to electrical hazards but also for your PC's well being due to the possibility of static electricity discharges that can damage your PC.
If you are in the least bit hesitant about opening the case of your PC, please err on the side of caution and seek professional help.