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When you install Windows XP, the installation
procedure prompts you to enter your user name and a company name.
Then, this information displays on the General tab of the System
Properties dialog box under the Registered To heading.
Unfortunately, Windows XP doesn’t provide you with a tool for
changing this registration information. However, you can alter the
registration information by editing the registry. Follow these
seven steps to alter the information:

  1. Launch the Registry Editor (Regedit.exe).
  2. Go to
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\Current
    Version.
  3. Locate and double-click the RegisteredOwner
    value.
  4. When you see the Edit DWORD Value dialog box,
    change the Value Data setting to whatever user name you want, and
    click OK.
  5. Locate and double-click the
    RegisteredOrganization value.
  6. When you see the Edit DWORD Value dialog box,
    change the Value Data setting to whatever company name you want,
    and click OK.
  7. Close the Registry Editor and restart Windows
    XP in order for the changes to take effect.

Note: Editing the registry
is risky, so be sure you have a verified backup before saving any
changes.