How can I stop NAV 2009 from trying to Install?

I have NAV 2008 running fine on my XP/SP2 Home Laptop.  I have also been running ZoneAlarm Free Version (5.5.094 - old, I know, but works fine) for years and it coexists fine with NAV 2008.

 

I received notification that a free upgrade to NAV2009 was available, so I started the process.  I then came to the Compatibility screen warning of a conflict with ZA, giving the option to Uninstall it, or Skip this step.  I then did some digging, and found that these two cannot coexist.

 

So, I want to just keep NAV 2008, and Zone Alarm, and just go back to where I was before I started the upgrade to NAV 2009.  The problem is, every time I reboot, NAV2009 keeps trying to install, with the same Compatibility screen coming up, with no close or cancel option.  I have to use Task Manager to end this task.

 

I don't see any entry for this in the Startup tab in MSCONFIG.

 

So - how do I stop NAV 2009 from trying to install every time I boot my computer???

 

Thanks.