Sounds to me like you only need to schedule RemoveExistingProducts in your 
InstallExecuteSequnce.
 
<InstallExecuteSequence>
 <RemoveExistingProducts After='PICK-YOUR-LOCATION-FOR-THIS-ACTION'/>
</InstallExecuteSequence>

________________________________

From: Robert Lee [mailto:genrobert...@gmail.com]
Sent: Wed 11/30/2011 3:12 PM
To: wix-users@lists.sourceforge.net
Subject: [WiX-users] Is major update supposed to duplicate the 
add/removeprograms entry?



I would like to develop an installer so that it would NOT force the user to
uninstall the application manually prior to installing new version. Just
running the new msi should update everything automatically.
As far as I understood the wix book, in order to achieve that, I should set
product ID in the markup to "*", keep the upgrade code, and increase
version number. But when I run the new msi, a new entry is added to
add/remove programs. How to prevent that?
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------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure 
contains a definitive record of customers, application performance, 
security threats, fraudulent activity, and more. Splunk takes this 
data and makes sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-novd2d
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