how do I make windows use all processors

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I have Windows 2008 on VirtualBox on Linux 2.6 on Athlon II X4 630 processor. When installing Windows the number of CPUs was set to 1 (I forgot to change it). Now I want Windows to use 2 processors (cores), so I changed the setting in VB, in Windows Device Manager I see two processors, but Windows Task manager shows performance graph for only one CPU (and I cannot change processor affinity for applications). So how do I upgrade from uniprocessor to multiprocessor? I found this document on MS site, but Windows doesn’t find any other computer types besides “Advanced Configuration and Power Interface (ACPI) PC”.

Answer

Try setting the number of cores in MSconfig>boot>advanced options. You have to reboot the 2008 VM after doing this.