Go to Control Panel, User Accounts. Is your account an Administrator level account? If so, this problem is caused by one of two Registry entries.
See
www.dougknox.com, Win XP Fixes, Windows Update Disabled - Network Policy.
--
Doug Knox, MS-MVP Windows XP/ Windows Smart Display
Win 95/98/Me/XP Tweaks and Fixes
http://www.dougknox.com
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Per user Group Policy Restrictions for XP Home and XP Pro
http://www.dougknox.com/xp/utils/xp_securityconsole.htm
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"Jack Hodges" <(E-Mail Removed)> wrote in message news:055601c3d2cb$425d4a30$(E-Mail Removed)...
> trying to do a windows xp pro update, am told I have to
> sign on as administrator. I don't know the administrator
> password (and never did know it) and can't proceed without
> it. Can anyone help?