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P4 Hyper threaded CPU is only showing 1 CPU under task manager

I have recently re installed ( clean install ) XP MCE and cannot see 2 cpu's under task manager.  There is no selection under view/cpu history , just one graph per CPU.

The CPU is P4 3 Ghz prescot that has been running quiet fine for some time. The bios starts and shows Hyper Threading enabled and I have downloaded utility from intel witch also shows that it is a Hyperthreaded CPU.  

Is there a registery setting of some kind to check or some other are to look at before i start swapping CPU's?
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mrwilde
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mrwilde
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1 Solution
 
garycaseCommented:
Open Device Manager (right-click on My Computer; select Properties; click the Hardware tab; then click on Device Manager);  then expand the "Computer" (click the "+" sign); and see what hardware abstraction layer (HAL) is installed -- it should say "ACPI Multiprocessor PC"
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wrwiii12Commented:
Go into your BIOS at startup.  Some BIOS need you to enable the CPU also that gives you a chance to see if the CPU is actually recognized in the lowest level.
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mrwildeAuthor Commented:
I have expanded computer and it sais standard PC - does that mean the ACPI is not running?

Does have to be set under bios?
I no the bios is allready set for Hyper threading enable
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wrwiii12Commented:
Hyperthreading does not mean 2 CPUs.  It means a single chip is acting like 2.  What brand of computer is it?  The bios should tell you one or two processors is what is sees.
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mrwildeAuthor Commented:
yes well aware of what hyper threading is
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garycaseCommented:
"Standard PC" means the hardware abstraction layer (HAL) is WRONG.    The HAL is set when you install XP based on the characteristics of the CPU ==> did you install it on a different computer and then move it to this one?   ... or did you have hyperthreading turned off in the BIOS when you installed XP?

Unfortunately, there's no way to change the HAL in XP except to do a complete new install.   Windows 2000 allowed the HAL to be changed -- but not XP.   I HAVE successfully done this -- but it's a very tricky thing to do and you can mess up your PC in doing so.   In fact I asked on this forum once, but didn't find anyone who knew how to do it either -- http://www.experts-exchange.com/Operating_Systems/WinXP/Q_21809283.html

This has nothing to do with what brand of computer you have -- it's simply that you have the wrong HAL.   The only fix is to re-install XP on this computer.

If you installed XP on this computer, you may have pressed F7 at the beginning of the installation process (when XP displays the "Press F6 if you have to install a third-party SCSI or RAID driver" message).   This bypasses XP's determination of the correct HAL, and installs a "Standard PC" HAL instead.   When this message is being displayed, you can press F6 to do as it says; or you can press F5 to force the HAL of your choice; or you can press F7, which will force a "Standard PC" HAL.   Normally you should let the XP installation routine choose the HAL.

If you don't want to do a clean install at this point, just do a Repair installation -- but press F5 and choose the correct HAL for your system (which as I noted before is "ACPI Multiprocessor PC").
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mrwildeAuthor Commented:
No that you mention that it makes perfect sense. I used a new utility called nLite to create unattended install. it asks for the type of HAL, witch I left @ default i think, witch is where i beleieve the problem arose.

So when the install asks "Press F6 if you have to install a third-party SCSI or RAID driver" i should press F5?
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garycaseCommented:
Yes, that will work.   OR just do a complete new install and let XP automatically set it correctly.
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mrwildeAuthor Commented:
OK thanks I will give that a shot and let you know the outcome
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