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Message: [QUOTE="Todd, post: 13376212"] Hi All, I just upgraded to Virtual Box 3.0.3 from 2.2.4 on a customer's machine. Both of his guests, XP-Pro-SP3 and Windows Server 2008-sp1, show two processors in the device manager. The VBox console shows two processors. But both guest machines can only use one processor. I get it: the wrong kernel is loaded. I have installed the new guest addition on both machines. So using search on Google, I found this (yes I use search!): SMP on a Windows XP guest without a reinstall: viewtopic.php? f=2&p=84602 Very nice direction. I remember doing this to native XP machines back when Hyperthreading first came out. Problem: with the "show compatible hard" box check (or even unchecked), I still only get "Advanced Configuration and Power Interface (ACPI)". On XP, I get an extra "Standard PC". What happened to my other compatible hardware? Specifically, I want "ACPI Multiprocessor PC". Anyone know how to fix this? What would keep both guests from showing the other compatible hardware? The customer is not going to be pleased if I have to reinstall both. :- ( Many thanks, -T [/QUOTE]