Unable to install MSI packages in SBS 2003 SP2

So I decided to make the plunge from SQL Server 2000 to 2008.  Fun fun.

I attempted to download the SQL Server Upgrade Advisor:


And attempted to launch the .msi file, and received an error:

The installation package cannot be installed by the Windows Installer service.  You must install a Windows service pack that contains a newer version of the Windows Installer service.

I'm running Windows SBS 2003 w/ Service Pack 2 installed.  I dont see any updates out there regarding this issue.  Does anyone have any ideas?
Who is Participating?
Lukasz ChmielewskiConnect With a Mentor Commented:
did you try to upgrade windows installer ?
Windows Installer 4.5 Redistributable is the latest I think
mtuepkerAuthor Commented:
Thanks, simple as that.  I google searched windows installer, and for some reason all i could find was for 3.1.  thanks!
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