IE8 turnoff NIS2008 phish protection, non-adminstrator can not turn it on

IE8 turnoff NIS2008 phish protection, non-adminstrator can not turn it back on even after IE8 is uninstsalled.

Two day ago, I installed IE8 on my Win XP Home Sp3.

IE8 turnoff NIS2008 phish protection.

Administrator can turn  NIS2008 phish protection back on.

However, non-administrator can not  turn it back on.

I have tried several things:

  1. uninstall IE8,

  2. uninstall and reinstall NIS2008,

  3. Norton removal and reinstall NIS2008,

non-administrator still can not  turn it back on even after IE8 is uninstsalled.

IE is not my favorite browser, I use other browser most of the time.

 

How to make non-administrator to be able to turn it back on?

Thanks,

David