Services running high and CPU usage high

Hello everybody,
Lately my HD is spinning like crazy and fans too.
I looked in Task Manager and I can see that services are running very high
and CPU usage is high also even when I do not perform any tasks.
I scanned my computer for viruses and it seams that it is clean.
A few weeks ago I installed Spybot and BitDefender but I uninstalled them
soon because I thought that they may interfere with eachother.
I ended unnecessary processes - now running 30.
I have also unticked non essential Start Up programs and Services - that did
not help.
To me it looks like there is something running in the background but how can
I detect it ??? It must be hidden somewhere.

My computer parameters:
IBM ThinkCentre
CPU 3 Ghz
RAM 2 GB
HD 233 GB (194 GB free space)
WIN2000 Pro with SP 4.
AV software- Avast.

I have this problem for the last few weeks and it is driving me crazy. I
spent countless hours trying to find the cause.
Please provide any suggestions.
Thank you in advance.
John
.

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