I had overheating problems with my dual-CPU system, which
were eventually solved by replacing the power supply.
While troubleshooting I pulled one of the CPU's and
changed the HAL to the standard ACPI PC via the Device
Manager. Now I can't switch it back; the SMP HAL is not in
the list (even if I uncheck "show compatible hardware")
and System Restore doesn't work. How do I get the SMP HAL
back without a complete reinstall?

I need to make clear that you can do a repair install, not a clean
install, so you won't lose your data or application settings.

--
Kent W. England, Microsoft MVP for Windows



"Kent W. England [MVP]" <(E-Mail Removed)> wrote in
message news:%23F%(E-Mail Removed)...
> You have to reinstall Windows and press F5 during install to select
your
> processor type, because ACPI is installed by default. See "How to
Force
> a Hardware Abstraction Layer During an Upgrade or New Installation of
> Windows XP" http://support.microsoft.com/?kbid=299340 for details.