Error message after you install a Windows Internet Explorer 7 update from
Windows Update or from Microsoft Update: "Webpage cannot be displayed":
http://support.microsoft.com/kb/942818

If tweaking your third-party firewall's settings don't help, try the
following:

1. Disable your anti-virus application, any real-time protection provided by
an anti-spyware application (except for Windows Defender; includes Spybot
Tea Timer, SpySweeper Guards, AVG AS guard.exe, etc.), disable any
third-party firewall AND enable the Windows Firewall.

NB: You're "working without a net" now: Don't to ANYTHING else online (e.g.,
browsing; reading email; chatting) except #4 below until your anti-virus
application has been re-enabled!  If you're running ZA Free firewall, you
may need to uninstall it instead of disabling it.

2. Uninstall "Security Update for Windows Internet Explorer 7 (KB947864)"
via Add/Remove Programs (make sure Show Updates box is checked at top right)
and reboot.

3. Re-do #1 above.

4. Go to http://windowsupdate.microsoft.com and install any Critical Updates
offered.  If "Root Certificates" update is listed in the Optional Updates
category, you might install it, too, to take full advantage of IE7's
additional security.

5. Reboot > Make sure everything in #1 above is enabled again and, if
applicable, disable the Windows Firewall and enable your third-party
firewall.

Hi,
If unsuccessful with the procedure posted by PA Bear, try
disabling/re-enabling startup programs to see which is causing the problem.
This article provides useful information except that you won't search for
msconfig (Vista) just go to Start> Run and type in msconfig.
929135- How to troubleshoot a problem by performing a clean boot in Windows
Vista: http://support.microsoft.com/kb/929135/

Hope this helps,
Don
[MS MVP- IE]

What if you go to Start | All Programs | Accessories | System Tools |
Internet Explorer (No Add-ons).

Well, thanks to your suggestions, this issue is now resolved.  I had
tried the MSCONFIG option to disable startup and services items, but
that didn't help.  I had also tried the IE with no add-ons, but
neither of these got me going.  But it would have helped if I could
have disabled the "TrueVector" service, but I wasn't allowed to do
that.  The core issue was that I had uninstalled ZoneAlarms /
Checkpoint Integrity firewall some time ago, but the uninstall did not
completely uninstall everything.  But oddly enough, the computer
worked fine until, I suspect, I downloaded a Windows update as PA Bear
suggested above.

The truevector service cannot be easily disabled.  This is by intent /
design to keep programs from turning it off I suspect.  Since I had
done an uninstall earlier, I couldn't try to do it again, and I have
long ago deleted the source installation program (it was a corporate
requirement way-back-when).  So I found this thread on Zone Alarms
user forum:

http://forums.zonealarm.org/zonelabs/board/message?board.id=inst&message.id=74308

In the event that this link is no longer active, here were the key
steps from an article written by "SlyFox" on the ZoneLabs board that I
did to manually uninstall the remnants of Zone Alarms:

* Launch Windows in Safe Mode (without Network support) by repeatedly
pressing the <F8> function key when the computer boots.

* Make sure hidden files and folders are shown. To do so, open Windows
Explorer. Depending on your OS click Tools or View and then Folder
Options > View.

Choose Show hidden files and folders, uncheck Hide protected operating
system files (Windows 2000/XP/2003 only) and click OK.

* Next go to Start > Search > Files and Folders. Make sure the
location box is set to search your Local Hard Drive (usually C:\ ) or
All Local Drives. Also make sure the Advanced Search Options are set
to search subfolders and hidden files. Now copy the entire line below,
paste it into the search box and click Search Now.

Zonelabs; "zone labs"; "Internet logs"; vsconfig.xml; vsdata.dll;
vsdata95.vxd; vsdatant.sys; vsmon.*; vsmonapi.dll;
vsnetutils.dll;vspubapi.dll; zaplus.*; zapro.*; **bleep**.dat;
zlparser.dll; zonealarm.exe; zoneband.dll; vsutil.dll; zlclient.*

A list of files and folders belonging to ZoneAlarm will appear in the
Search Results pane.

Note: if you’re using McAfee software be sure to check the vsutil.dll
if found: right click the file and choose Properties. Verify it
belongs to ZoneLabs.

If it does not do not remove it. Now proceed by deleting all ZoneLabs
files and folders that were found.

* Empty the Recycle Bin.

* Now remove all ZoneLabs keys that may be left in the Windows
registry. To do this copy the lines below and paste them into Notepad.

Save the file as zabegone.reg, double click it and allow for the
registry changes to be made.

REGEDIT4

[-HKEY_CLASSES_ROOT\ZAMailSafe]

[-HKEY_CURRENT_USER\Software\Zone Labs]

[-HKEY_LOCAL_MACHINE\Software\Zone Labs]

[-HKEY_USERS\.DEFAULT\Software\Zone Labs]

* REBOOT

ZoneAlarm will now be completely removed from your computer. If you
wish to install a new copy of ZA, be sure to do so under an
administrator account with full rights and permissions.