I need to know this since this is a pre-req for .NET 3.5 and if I\'m including the .NET bootstrapper, I should also see if Windows Installer 3.1 is needed.
Right now
If you want to check the version of the Windows Installer on your system, check the version of MSI.DLL in the Windows\System 32 folder.
Right click on MSI.DLL , select properties -> go to Details tab and check file version.