First, what is wrong with the way merlwiz79 suggested? The user asked about using a live cd and merlwiz79 is a Linux user, so why not a Linux solution?
Also, what if the user wanted to move some system files or other files that are in use when Windows is running. We really don't know what the thread starter's purpose is here.
What if the thread starter doesn't have the Windows drivers for the thumb drive? In Linux they are probably already there.
Just playing devil's advocate a little bit.