Sometimes when you purchase a PC that comes with XP pre-installed the    actually copy of XP (usually on OEM (Original Equipment Manufacturer)    copy) may be registered to the company that build the PC. To change the    registration details do the following.

NOTE

Before proceeding to edit the Registry be sure to make a backup copy.    This can be achieved by using a third party freeware application called    ERUNT.

1/ Click the Start Button.

2/ From the Start menu click Run.

3/ In the Run dialog box type: regedit.

4/ The Registry editor will now open.

5/ Navigate to the following key:    HKEY_Local_Machine\Software\Microsoft\WindowsNT\Current Version

6/ Once you have reached the Current Version key take    a look in the Right Hand Pane and look for    ‘Registered Owner’.

7/ Right click the Registered Owner key to edit it.

8/ To edit the key Right click the entry and select    Modify.

9/ At the same time you might also like to change the Registered    organisation. This option is situated just above the registered owner    option.

10/ To edit the key Right Click the entry and select    Modify

Microsoft link

http://support.microsoft.com/kb/310441

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