Doesn't sound like it's working for some reason. I'm sorry for all the trouble you're having.
What size is the flash drive?
What operating system do you have on the laptop?
Your desktop is basically un-usable with all the permission issues.
You use Windows Live Mail (WLM) as your email client.
You have access to a laptop (that's how you got the ISO downloaded).
-Can you do the data export from WLM to an external drive, for importing later, on your desktop?
Perhaps you can start the download over while you're sleeping? Or, is it possible to go to the local library or someplace with a fast internet connection tomorrow to download the media?