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Windows 7: After upgrade, only one core is seen

05 Feb 2009   #1

Windows 7
After upgrade, only one core is seen

I upgraded from vista to windows 7. Its worked like a charm, but there are one problem.
I have a q6600 cpu(4 cores), and after the upgrade windows see just one core.
(In task manager(One Graph per cpu checked)/Resource Monitor)
In the Device Manager under Processors are listed 4 "Intel(R) Core(TM)2 Quad CPU @ 2.40GHz" device.
I reinstalled the old drivers, removed them but no luck.

Any advice?

My System SpecsSystem Spec
05 Feb 2009   #2

64-bit Windows 10 Pro

Hello Benedicht, and welcome to Seven Forums.

Check the tutorial below to make sure that everything is unchecked in step 7 there.

Boot Advanced Options - Number of Processors - Vista Forums

If that does not help, then see if resetting the BIOS back to default settings will allow the CPU to be recognized properly afterwards.

Hope this helps,
My System SpecsSystem Spec
05 Feb 2009   #3


Also check this thread as it could be the HAL settings -
My System SpecsSystem Spec

05 Feb 2009   #4

Windows 7

Thx for the quick replies, i will check them.

And thx Brink to moveing my post to the right forum.
My System SpecsSystem Spec
05 Feb 2009   #5

Windows 7

The secound tip worked.
Thank you all.
My System SpecsSystem Spec
05 Feb 2009   #6

64-bit Windows 10 Pro


I'm happy to hear that you got it sorted. Thank you for posting back your results.
My System SpecsSystem Spec

 After upgrade, only one core is seen

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