Convert or Upgrade Windows XP Home to Professional Without Reinstalling

Here’s a trick to turn Windows XP Home Edition to Windows XP Pro, from within the operating system without going through installation.This doesn’t install or add all the features from Windows XP Professional, such as Remote Desktop Server (Install Remote Desktop on XP Home) and Group Policy Editor (GPedit) utility tools, which was removed from Windows XP Home edition. Some functions which turned off and disabled via integrated switches which read from registry flag whether it’s Home or Professional edition, such as EFS, RAID support and ability to join domain, may or may not work after migration. Basically, the trick only work to let Windows XP recognizes itself as Professional edition.

To convert or upgrade Windows XP Home to Windows XP Professional, follow procedure below.

  1. Open Registry Editor (regedit).
  2. Navigate to HKEY_LOCAL_MACHINE/SYSTEM/ControlSet00X/Control/ProductOptions, where ControlSet00X is the one with the highest number.
  3. Delete the ProductSuite registry key.
  4. Then, create a new DWORD value and named it as Brand.
  5. Set the “Brand” value data as 0.
  6. Reboot the system.
  7. On boot up after the BIOS screen, press F8 to display Windows XP Startup Menu.
  8. Choose Last Known Good Configuration and hit Enter.

Windows XP will start up as usual. After logging into the desktop, check the system properties to verify that it’s now Windows XP Professional.

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