VirtualBox – Windows XP Guest – how to update from single to multi-core so XP recognizes them?

If you have a copy of Windows XP (in my case installed as a virtual machine on a Linux Host) and you installed XP with only 1 CPU, you’ll be sad to notice that telling virtualbox (or upgrading your CPU to multi-core if not using VirtualBox) will not in itself allow XP to see the extra cores! To fix that, follow these steps (taken from this URL: http://www.notebookforums.com/t/183802/enable-dual-core-support-in-a-windows-xp-single-core-install):

Hal / NToskrnl replacement:
a. Make a directory called DUO on C:\
b. Copy halmacpi.dll (search your C:\ drive for this) to C:\DUO then rename it to hal.dll
c. Copy ntkrnlmp.exe (search your C:\ drive for this) to C:\DUO then rename it to ntoskrnl.exe
d. Make a batch file called go2core.cmd and put this in the file.

C:
CD\windows\system32
REN hal.dll hal.old
copy C:\Duo\hal.dll C:\windows\system32
REN ntoskrnl.exe ntoskrnl.old
copy C:\Duo\ntoskrnl.exe c:\windows\system32

e. Run Go2Core.cmd from C:\duo directory.
f. Reboot and you should now see two processors in Task manager


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