Hi,
You probably have an incompatible browser add-on.
See: http://www.enhanceie.com/ie/troubleshoot.asp
for troubleshooting information.

Installing the latest version of the troublesome add-on may resolve this, or
the add on may not yet be compatible with IE7.

The troublesome program may not show up as an add-on. Disable other
security, privacy, ad-blocking programs to see if one of them is causing the
problem. Any program that interacts with Internet Explorer could be causing
this. The connection with IE may not be obvious, such as Google Desktop.

A firewall will probably not be causing this problem, but turn on the
Windows Firewall from Control Panel> Windows Firewall before disabling a
third-party firewall or security suite.

Hope this helps,
Don
[MS MVP- IE]

"Mr. Larry" <Mr. Larry[at]discussions.microsoft.com> wrote in message
news:B87E5235-26FE-4352-9267-C7B7838058EA@microsoft.com...
> When I close the IE 7.0 window, I get a dialog box showing:
>
> iexplore.exe - Application Error
> The instruction at "0x74985c91" referenced memory at "0x00000000".
> The memory could not be "read".
> Click on OK to terminate the program.
>
> How can I stop this from happening?