Weird CPU Usage problem 0_o

[PowerGamer]

Recently I reformatted the computer since windows restarted every time it tried to boot, I managed to rescue my data (by creating another profile on boot.cfg and installing windows on the profile and then I logged into safe mode to transfer the files to another hard drive)...

Anyway, since the reformat my cpu has been acting up, when I open up the task manager and the Process tab, the cpu usage never goes above 20%,
BUT, when I click the performance tab the CPU is constantly moving from 50-90 percent (it reaches 100 only when a lot of programs are running).
This has never happened before, I never had that much CPU usage before.

My system specs:
Via P4M800 Motherboard
Intel Pentium 4 - 3.00GHZ (with Hyper Threading on)
512MB of system ram
Radeon 9250 256mb (in a week, im getting the 9800 Pro for free.. a bit of an upgrade, from my uncle)

Any suggestions? How can I tell what is using my CPU when either nothing is really using it, or I can't see what is using it.

Thanks in advance

[Jabor_]

I'll leave Spybot, SpyDoctor and SpySweeper on running at night as well as a full system scan with Kaspersky and i'll report back tomorrow.

I did do a spydoctor scan a few days ago and it didnt find anything

You realise that SpyDoctor is on the list of "rogue" antispyware tools, right? I sincerely hope you didn't pay anything for that pile of false-positives.

[HBK026]

Antivir is very very good

[PowerGamer]

You realise that SpyDoctor is on the list of "rogue" antispyware tools, right? I sincerely hope you didn't pay anything for that pile of false-positives.

sorry my bad - not SpyDoctor - Spyware Doctor
SpywareDoctor from PC-Tools
http://www.pctools.com/spyware-docto...iew/spydoctor/

lol...

[xXpsychoXx]

Oh my.. the exact same thing happened on my other computer.. couple of weeks later completely broke [couldnt turn on couldnt do anything at all] I had to buy a new computer, I tried freakin everything i could think of =|
You COULD be dealing with the same thing or something else but you can always try your antivirus, anti spyware/adware and defrag

[PowerGamer]

I don't think it'll break for no reason like your's did <.<
im getting a new computer in the summer anyway,
but I hope this one doesn't break 0_o

[Dead Eyes]

my laptop did exactly the same thing recently, sony are fixing it though. It was a harddrive fault.