I'm going to suggest that you try downloading the Wubi.exe again
Download | Ubuntu the one you have now made be corrupt.
I downloaded it yesterday and got that first window change the settings to what I wanted and followed through and I'd say in 20 to 30 min that's with a cable broadband service I had it up and going.
If that doesn't help maybe somebody else is will read this and help.
Or go here
Installation & Upgrades - Ubuntu Forums and tell them You are trying to install Wubi That's what the download site says to do.
Jerry