Quad core shows only 2 cores in task manager in windows xp

I am using sp3 win xp 32bit and have installed a 3ghz quad core . I have the same motherboard at work (p5n-d asus) and that one is showing 4 cpu's in task manager under proformance tab and show all cores.

My problem is my home comp shows only 2 cores in the window and not 4 cores like my work comp?

What is the problem?

3 answers Last reply
More about quad core shows cores task manager windows
  1. did you change the CPU fro a Dual core to a Quad core?

    does the BIOS see all four cores?
  2. Check the device manager under "computer". It should read something like ACPI mutiprocessor PC. if it doesn't, the wrong HAL may be installed. Right click it and select update driver then select the correct HAL.

  3. In device manager, under Processors, are 4 CPUs with the same name listed?
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