laptop Hp nx6320 is very sluggish on XP

laptop Hp nx6320 is very sluggish o n Xp. I  have rebuilt the pc from scratch and when i log in, CPU is running at 100%, I have checked what services is running and theres nothing out of the ordinary that suggest its taking up all the CPU usage.
Any advice will be great
thanks
dowhelpdeskAsked:
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nobusCommented:
you installed all the drivers for the mobo?
does it run normal in safe mode?
you can try a bios update too.
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JonveeCommented:
Did you ensure that the high CPU usage is not due to svchost ?

Also try turning off your MS 'automatic updates', then reboot.   Manually select Windows updates, install the appropriate ones, then turn on automatic updates once again.  Reboot.  

If unresolved, see if there's anything appropriate here >
http://kadaitcha.cx/high_cpu.html
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JonveeCommented:
Since rebuilting the PC, have you been using the internet?  
If yes, and unless you are absolutely sure the machine is clean, may i suggest you run a few scanners such as Malwarebytes.  
Recommend downloading, then updating Malwarebytes' Anti-Malware:
http://www.malwarebytes.org/mbam.php
When updated, reboot into Safe Mode by selecting F8 at bootup & run a scan.

Tutorial available, if you require >
http://www.bleepingcomputer.com/forums/lofiversion/index.php/t169669.html

Also, the Kaspersky free online virus scanner:
http://www.kaspersky.co.uk/virusscanner

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JonveeCommented:
One other thought ... another cause of sluggishness could be your HD ... if still unresolved, you may wish to try the appropriate diagnostic here for a HD test >

"Hard Drive Diagnostics Tools and Utilities":
http://tacktech.com/display.cfm?ttid=287
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cfusitsCommented:
If you check in 'Task Manager' Which process is taking up all the resources?
remember to check 'Show processes from all users'.
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dowhelpdeskAuthor Commented:
Thanks for all your advice.
I have done all the regular troubleshooting, example: test HDD, Ram, scanned for virus but still no indication what might be causing the slowness.
Checked Task manager and one of svchost image was using up the CPU, checked what services was running against it but still no indication of its abnormalities.

IHP will change motherboard, will see if that fixes the problem
Anyways, thanks for all your help people

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Windows XP

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