There are two different fixes, depending on the Windows updates you have installed.
The original fix for the older update was this:
First, click Start> Settings> Folder Options> View tab, and click to enable "Show All Files" and click OK.
Click Start> Find> File or Folders, and search the C:\ drive for a file named Tshoot.inf...it should be found in the \Windows\Inf folder.
Right-click Tshoot.inf and click Install on the menu that appears.

If the latest cumulative patch for Internet Explorer (November) is installed, there is only a workaround.
See here:
http://home.comcast.net/~bascon58/98Help.htm
and
http://mvps.org/PracticallyNerded/SoftFixes.htm

There are 2 separate fixes depending on which is the last critical update you have
installed. See here for info:
http://home.comcast.net/~bascon58/98Help.htm

If you have installed the latest IE Cumulative Update...
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bull
etin/MS03-048.asp
which is the infamous Q824145, itself, then you have lost your
Troubleshooters.

Then... or even if you haven't yet...

Take the critical update, because it says it does more than just turn on
the "kill bit" that seems to prevent those Troubleshooter screens.
Afterwards, if you must see the Troubleshooters...

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q188867
Troubleshooting Windows 98 Startup Problems. This article contains a
link to what it says is the equivalent of Windows Help
Troubleshooters...
http://support.microsoft.com/support/windows/tshoot
That's it. But, here is how to get them back when offline...

(1) "START, Run, RegEdit"
(2) Navigate to

HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX
Compatibility\{4B106874-DD36-11D0-8B44-00A024DD9EFF}

Compatibility Flags   0x00000400 (1024)    <<Dword value 400

by
(a) Clicking plus signs, beginning with "HKEY_LOCAL_MACHINE",
(b) & ending with "ActiveX Compatibility".
(c) Finally, click "{4B106874-DD36-11D0-8B44-00A024DD9EFF}" itself in
the left pane.
(d) Now, you see "Compatibility Flags   0x00000400 (1024)" in the right
pane.
(e) "Registry menu, Export Registry file".

     This will create a ".reg" file of the entire Key that is open...
all the items in the right pane & all sub-keys in the left pane (if
there is a plus sign). Give it a name & location of your choosing, even
to the Desktop or My Documents. Then, to undo the following, you will be
able to simply click that file, to Merge it's contents back into the
Registry.

Actually-- name that one "NoTrouble.reg". It will look like...

...Start.....
REGEDIT4

[HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX
Compatibility\{4B106874-DD36-11D0-8B44-00A024DD9EFF}]
"Compatibility Flags"=dword:00000400

...End.......

(f) Close RegEdit. You now have an "undo" .reg, named "NoTrouble.reg".
(g) Make a copy of it called "Trouble.reg".
(h) Open "Trouble.reg" in Notepad. Change the "dword" to look as
follows... all zeros...

...Start..of "Trouble.reg"...
REGEDIT4

[HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX
Compatibility\{4B106874-DD36-11D0-8B44-00A024DD9EFF}]
"Compatibility Flags"=dword:00000000

...End.......

CAREFUL: That "HKEY" is one line, with TWO spaces only. One between
"Internet Explorer", & the other between "ActiveX Compatibility". Make
sure it looks that way in Notepad, before you click to Save. Also, you
must have a blank line at bottom.

Now, "Trouble.reg" gives you the Troubleshooters. "NoTrouble.reg" will
give you security by taking them away. Remember to undo it, after you
are done looking at the Troubleshooters.

(2) By default, when a ".reg" is clicked, it will Merge into the
Registry. To alter the default behavior: "START, Settings, Folder
Options, File Types tab". Scroll to & click "Registration Entries",
click the "Edit" button, select "edit" in the window & click the "Set
Default" button. Now, when you click a ".reg" file, it will open in
Notepad for examination. To merge it into the Registry, R-Clk it &
select "Merge".