computer does not install Session Editor 2.5.1

Being just new to Proteus, I downloaded Proteus Session Editor ver 2.5.1 from the Mindplace website. What I get is a zipped file that opens installer on my computer. Only, the installer gets stuck right from the beginning leaving only one button to click on: "exit setup". Which sums up what is happening: nothing at all.
How can I install Session Editor on my computer??
My OS is Win Vista.

Hello and welcome!

I'm sorry to hear about the trouble you're having with the installation of the Proteus Editor.

What error message are you getting?

Attached is a video of the normal installation. Can you tell me where you are getting stuck?
http://www.mindplacesupport.com/Down...eus Editor.gif