Changing the HAL from Multiprocessor to Single processor after P2V conversion

1. Before making any changes to the VM, Create a Snapshot in Virtual Center.
2. Right click on the VM you want the Snapshot for and go to Snapshot
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4. Click Take Snapshot
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6. Name it and click OK
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8. Snapshot will create
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10. RDP or Console into the Server and go to Device Manager
11. For Windows Server 2003, install the following hotfix. It does not require a reboot. This hotfix allows you to downgrade to Uniprocessor. WindowsServer2003-KB923425-v2-x86-ENU.exe
12. Expand the Computer tab to see what HAL is loaded
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14. In this case, this server used to have 2 processors when it was in its physical form. This needs to be changed. To do so, Right click on ACPI Multiprocessor PC and choose Properties
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16. Click the Driver tab
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18. Click Update Driver
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20. Click Next
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22. Choose Display driver so I can choose and click Next
23. It will show you this screen
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25. Choose “Show all hardware of this device class”
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27. Choose ACPI Uniprocessor PC and click Next
28. You will be warned about changing this driver, but don’t worry, if it fails, we can revert from the Snapshot we took!
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30. Click Yes to continue
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32. Click Next
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34. Click Finish
35. Click Close
36. You will be asked to reboot the computer. Here is where we will find out if it boots cleanly!
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38. If the Computer reboots cleanly and everything seems to work, clean up the Snapshot you took. Verify in Device Manager that the HAL has changed. This should really improve the VM’s performance!
39. To cleanup the SnapShot, Open Snapshot Manager
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