Access Denied when create system repair disc and system image

I have 'access denied' problem when I tried to create system repair disc and create system image. I read this forum

http://social.technet.microsoft.com/Forums/en-US/027bf2d0-f9e7-4c2f-93cc-a55d999b9014/cant-create-a-system-repair-disc?forum=w7itprogeneral

but I am not sure it applies to my situation. I am logging into windows 7 pro as local administrator. Any help is appreciated

Thang Mo