See 'Known issues with this security update > Controls that prompt before
they are loaded' section of http://support.microsoft.com/kb/931768

1. Try opening IE in No Add-ons mode & see if this behavior persists. If it
doesn't, change your IE home page to "blank" then close IE7 and reopen
normally (i.e., with all Add-ons enabled) and see if the behavior returns.

2. If still no joy, reopen in No Add-ons mode, reset IE settings
(http://support.microsoft.com/kb/923737), close IE, open normally and see if
the behavior still persists.

This is all related to a cross-site security vulnerability addressed by
MS07-027/KB931768: http://secunia.com/advisories/24535/

Also try this fix, courtesy of MVP Robert Aldwinckle:

Start > Run > Type or copy/paste the following into the box:

iexplore.exe -nohome -extoff

[Note the spaces in the line above!]

--
~Robear Dyer (PA Bear)
MS MVP-Windows (IE, OE, Security, Shell/User)
AumHa VSOP & Admin; DTS-L.org

andy mackie wrote:
> After installing the latest windows updates today, IE7 now dies when
> trying
> to start, giving a security warning about navcancl from ieframe.dll.
>
> I've saw a couple of other posts suggest it's KB931768 that's causing the
> problem.
>
> Doing a system restore to before this update got things working for me.
> Any
> idea as to what the problem is ?
>
> Thanks,
> Andy Mackie