Important Computer Security, what you MUST do:
Service Pack Installation Checklists for
Windows XP, Windows Vista
and other versions of Windows.
Many potential issues may be eliminated by following
good Safety & Security practices
1. Verify you are attempting to install SP-2 using a profile with Administrator access.
2. Try a different profile that has Administrator access, create one if you do not already have another
3. You receive an "Access is denied" error message when you try to install Windows XP Service Pack 2
4. Follow the Service Pack Installation Checklist