Converting Windows XP Home Edition to Windows XP Pro:

1. go to HKEY_LOCAL_MACHINE/SYSTEM/ControlSet00X/Control/ProductOptions
where ControlSet00X is the one with the highest number and delete
the key “ProductSuite” completely.

2. Create a new key named “Brand” of type “DWORD” and set it’s value to “0″.

3. Reboot the system.

4. After BIOS-screen, press F8 and choose “Last Known Good Configuration”.
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qwinsta = Query WINdows STAtion
rwinsta = Reset WINdows STAtion