There is an unsaved comment in progress. You will lose your changes if you continue. Are you sure you want to reopen the work item?
Apparently, if you download a 64bit iso to a 32bit OS and try to 'burn' the USB (or DVD?) boot image. it will fail. The 'fix' according the MS Store sight is to download a copy of bootsect.exe from within your account at the store and save it to the folder
where the tool resides. The problem is that you must have purchased Win7 from the Store to get the file.
If you downloaded it from any other source (e.g., TechNetPlus) the file is unavailable to you.
It is possible to find it in at least one location on the Web. It ought to be available on Codeplex and/or TechNetPlus (at least).