Use Regedit.exe and search for NoBrowserOptions and remove it.
It is most likely to be here (but not necessarily)
HKEY_CURRENT_USER\Software\Policies\Microsoft\Inte rnet
Explorer\Restrictions
If you are unfamiliar with Regedit, then ensure you know how to
restore your Registry in case of error and it is a good idea to export
any key before deleting.

Check the startup (Start-Run-MSCONFIG-Startup tab) for any unknown
items if it is reset on reboot.

If you use SpyBot's Immunize feature, then you can unlock in Tools-IE
Tweaks-"Lock IE Control Panel"

....Alan
--
Alan Edwards, MS MVP Windows -Internet Explorer

On Wed, 13 Jun 2007 06:41:00 -0700, in
microsoft.public.internetexplorer.general, Mike51
<Mike51@discussions.microsoft.com> wrote:

>I'm on my son's laptop now, but on my desktop I wasn't able to type in forms
>or email but I COULD type in URL field. I thought it might be a setting in
>Internet Options, but when I tried to view, I get message, "This operation
>has been cancelled due to restrictions in effect on this computer. Contact
>system administrator.
>
>This is a home PC running XP Home and I.E. 7.0
>
>I've never had this happen and I would appreciate any help in resolving this
>ASAP....thank you in advance.