Not a Microsoft's Windows person here, but, I did encounter few problems months ago with people using the Microsoft's OS.
Twain is for the scanner, and If recall it's a 32-bits binary, I don't know much about Microsoft's compatibility with 32-bits, thus an option is to un-select it for the installation.
Another solution (which worked for me to install GIMP on the Microsoft's Windows OS) is to install GIMP as an Administrator > right click on the installer > Run as Admin (or similar)
Twain is for the scanner, and If recall it's a 32-bits binary, I don't know much about Microsoft's compatibility with 32-bits, thus an option is to un-select it for the installation.
Another solution (which worked for me to install GIMP on the Microsoft's Windows OS) is to install GIMP as an Administrator > right click on the installer > Run as Admin (or similar)