Dual core - one core lost in XP Pro

I did a repair install and upgraded to SP3 but have noticed the system is
now only using one core of a dual core processor.

Device manager shows two processors, Everest shows both but a performance
test shows
half usual performance, BIONC software is only running one core but used to
use two?

System in ASUS P5K-VM with Intel E6850 (Dual core)

I did a temp install on another drive and both cores work just fine so HOW
can I restore access to both on existing installation???

Any suggestions,
M

--

mettá wrote:

> I did a repair install and upgraded to SP3 but have noticed the system
> is now only using one core of a dual core processor.
>
> Device manager shows two processors, Everest shows both but a
> performance test shows half usual performance, BIONC software is only
> running one core but used to use two?
>
> System in ASUS P5K-VM with Intel E6850 (Dual core)
>
> I did a temp install on another drive and both cores work just fine
> so HOW can I restore access to both on existing installation???

Just because hardware is listed doesn't mean the correct driver was
installed for it. When you did the inplace (repair) install, did you
select the multiprocessor HAL (hardware abstraction layer)? One way to
check is to look in Device Manager (devmgmt.msc) and look under the
"Computer" node. Is a uniprocessor HAL listed, or a multiprocessor one?

If a uniprocessor is listed, you can change the HAL using the hardware
config wizard rather than do a (custom) repair install again. Update
the driver for the "Computer" processor, specify that you will pick a
driver from a list (so you can see the list), and select a
multiprocessor HAL. For example, if it now says "ACPI Uniprocessor PC"
then select "ACPI Multiprocessor PC". You will very likely need to have
the installation CD ready for it to yank file(s) from there to update
the HAL.

Read: http://support.microsoft.com/kb/309283/en-us

Thanks,

Checked and it says multi... so this is not the answer, tried updating
driver to no avail??

M

"VanguardLH" <V@nguard.LH> wrote in message
news:aLqdnRdyeej80-LVnZ2dnUVZ_obinZ2d@comcast.com...
> mettá wrote:
>
>> I did a repair install and upgraded to SP3 but have noticed the system
>> is now only using one core of a dual core processor.
>>
>> Device manager shows two processors, Everest shows both but a
>> performance test shows half usual performance, BIONC software is only
>> running one core but used to use two?
>>
>> System in ASUS P5K-VM with Intel E6850 (Dual core)
>>
>> I did a temp install on another drive and both cores work just fine
>> so HOW can I restore access to both on existing installation???
>
> Just because hardware is listed doesn't mean the correct driver was
> installed for it. When you did the inplace (repair) install, did you
> select the multiprocessor HAL (hardware abstraction layer)? One way to
> check is to look in Device Manager (devmgmt.msc) and look under the
> "Computer" node. Is a uniprocessor HAL listed, or a multiprocessor one?
>
> If a uniprocessor is listed, you can change the HAL using the hardware
> config wizard rather than do a (custom) repair install again. Update
> the driver for the "Computer" processor, specify that you will pick a
> driver from a list (so you can see the list), and select a
> multiprocessor HAL. For example, if it now says "ACPI Uniprocessor PC"
> then select "ACPI Multiprocessor PC". You will very likely need to have
> the installation CD ready for it to yank file(s) from there to update
> the HAL.
>
> Read: http://support.microsoft.com/kb/309283/en-us

On Jul 20, 6:49*pm, "mettá" <me...@removethismetta.org.uk> wrote:
> Thanks,
>
> Checked and it says multi... so this is not the answer, tried updating
> driver to no avail??
>
> M
>
> "VanguardLH" <V...@nguard.LH> wrote in message
>
> news:aLqdnRdyeej80-LVnZ2dnUVZ_obinZ2d@comcast.com...
>
> > mettá wrote:
>
> >> I did a repair install and upgraded to SP3 but have noticed the system
> >> is now only using one core of a dual core processor.
>
> >> Device manager shows two processors, Everest shows both but a
> >> performance test shows half usual performance, BIONC software is only
> >> running one core but used to use two?
>
> >> System in ASUS P5K-VM with Intel E6850 (Dual core)
>
> >> I did a temp install on another drive and both cores work just fine
> >> so HOW can I restore access to both *on existing installation???
>
> > Just because hardware is listed doesn't mean the correct driver was
> > installed for it. *When you did the inplace (repair) install, did you
> > select the multiprocessor HAL (hardware abstraction layer)? *One way to
> > check is to look in Device Manager (devmgmt.msc) and look under the
> > "Computer" node. *Is a uniprocessor HAL listed, or a multiprocessor one?
>
> > If a uniprocessor is listed, you can change the HAL using the hardware
> > config wizard rather than do a (custom) repair install again. *Update
> > the driver for the "Computer" processor, specify that you will pick a
> > driver from a list (so you can see the list), and select a
> > multiprocessor HAL. *For example, if it now says "ACPI Uniprocessor PC"
> > then select "ACPI Multiprocessor PC". *You will very likely need to have
> > the installation CD ready for it to yank file(s) from there to update
> > the HAL.
>
> > Read:http://support.microsoft.com/kb/309283/en-us

I just went to a dual core processor. It seems to officially see the
second core processor when you complete the motherboard chipset driver
install. XP may have an older version of the "correct" chipset driver
but it is always recommended to get the latest motherboard chipset
driver from the maker of your motherboard.