Software Deployment

Hi All,

I have a problem doing a system search. I am using Installshield. The package that I am creating is supposed to search for the presence of Sentinel Driver in the user machine. We have an msi for Sentinel Driver in our environment. So, I am doing a system search for the uninstall reg key, HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\{ProdGUID}

So, in system search I put the above key and reg value as 'DisplayName'.
I stored the value in property 'CHECKSENTINEL' and created an install condition.
Condition : CHECKSENTINEL
Message : Sentinel Driver needs to be installed in the machine.

When I install my package in a clean machine, it gives the error popup rightaway like it should. THen I install the Sentinel package, followed by my package and I still get the error popup. Only this time, the message comes after the install welcome dialog. In the verbose log, it says error 2835 "Control ErroIcon was not found on dialog SetupError".
Can anyone point out ahat I am doing wrong? Thanks in advance.