Question

I have an activeX control, that ask the user if he want’s to install it every single time the page loads (Even if it is already installed)…

Can anyone point me in the right direction? What I have tried so far:

• Setting new Guids for the class & interface.
• Changing interfaces names & method names.
• Changing version number
• Uninstalling and re-installing the activeX

Answer 1

First see this MSDN post it sounds like what you are experiencing.

This can happen when the VerCache
registry key may not have got updated
during the upgrade of the control. For
example,
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings{D7D5ACA4-
4C57-4C75-8D68-BC185E924B4C}]
“VerCache” This happens if the old and
new versions of the control have the
same “Created” date time stamp,
“Modified” date time stamp and the
file size.

If this registry key doesn’t exist,
you may have to use the Sysinternals
Process Monitor tool to log a repro of
the problem, then search the log for
the correct registry value that is
being checked. It’s most likely under
\Ext\Settings{}…but
regardless, ensure that at least one
of these parameters – “Created” date
time stamp, “Modified” date time stamp
or the file size, on the updated
control is different from the old
version of the control.

Also, I would use Process Monitor (Sysinternals) as the user installs the ActiveX control to check that it is making the correct registry entries. Search through the registry for the any GUID’s associated with your “old” controls and latest. You may want to backup your registry before actually deleting any registry keys.

You could also try a registry cleaning or search tool.

If these don’t help perhaps you could provide some more details about your ActiveX control.

1. Did you use binary compatability?
2. What Version of windows of user?
3. Which version of IE of user?
4. Is this only happening to this user? (this works for others?)

---

Did the user re-install any software lately?

How about checking :

• The registry (Does your ActiveX make any registry changes?)
• The user’s PATH environment variable

Have you had the user unregister the dll? You can run this from the cmd line where the dll file is located on the hard drive:

From the command prompt, type “regsvr32 /u filename.dll” where “filename” is the name of the file that you want to unregister.