What has worked for a number of people, at least using Vista 32bit, is to open MSCONFIG, then open the BOOT TAB and click the ADVANCED button.
In this there are two check boxes at the top... one for BOOT PROCESSOR NUMBER, this is for the number of cores. Tick the box and select the number of cores which are present in the system.
The other checkbox is for the amount of RAM present in the system. Tick this box also and dial in the total amount of RAM present (this is for 4GB users as well), or the maximum the selector window will allow.
REBOOT and run
DETECT HAL checkbox should be ticked automatically after reboot.
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