Upgrade from Core2Duo to Quad core only shows 2 cores in task manager (0/1)

I recently upgraded my Vista64 Ultimate from an E8600 to a Q9550.

In the task manager, it only shows 2 cores.

Device Manager shows all 4 CPU's.
Bios shows all 4 CPU's.

Any ideas on how to correct this?

Attached are screen shots showing the problem.

on task manager click on view ,1 graph per cpu,that should do it.
"I Drive Fast" <> wrote in message
news:...
>I recently upgraded my Vista64 Ultimate from an E8600 to a Q9550.
>
> In the task manager, it only shows 2 cores.
>
> Device Manager shows all 4 CPU's.
> Bios shows all 4 CPU's.
>
> Any ideas on how to correct this?
>
> Attached are screen shots showing the problem.
>

Reinstall Windows.

"I Drive Fast" <> wrote in message
news:...
> I recently upgraded my Vista64 Ultimate from an E8600 to a Q9550.
>
> In the task manager, it only shows 2 cores.
>
> Device Manager shows all 4 CPU's.
> Bios shows all 4 CPU's.
>
> Any ideas on how to correct this?
>
> Attached are screen shots showing the problem.

"Richard G. Harper" <> wrote in message
news:3AE9E343-11C3-4FC2-8C94-...
> Reinstall Windows.
>
> "I Drive Fast" <> wrote in message
> news:...
>> I recently upgraded my Vista64 Ultimate from an E8600 to a Q9550.
>>
>> In the task manager, it only shows 2 cores.
>>
>> Device Manager shows all 4 CPU's.
>> Bios shows all 4 CPU's.
>>
>> Any ideas on how to correct this?
>>
>> Attached are screen shots showing the problem.
>

Why? The ACPI driver for Vista x64 is the same for all systems so why
reinstall?

"I Drive Fast" <> wrote in message
news:...
>I recently upgraded my Vista64 Ultimate from an E8600 to a Q9550.
>
> In the task manager, it only shows 2 cores.
>
> Device Manager shows all 4 CPU's.
> Bios shows all 4 CPU's.
>
> Any ideas on how to correct this?
>
> Attached are screen shots showing the problem.

Since Device Manager shows all 4 cores, there's probably no
problem with Vista itself. For a second opinion, get CPU-Z
from cpuid.com. If it reports 4 CPUs, the issue is with Task
Manager only. The fact that TM sees 2 cores indicates that the
system is correctly identified as an ACPI Multiprocessor system.
A check with Device Manager will confirm this.

Besides CPU info, CPU-Z gives detailed memory info.