Hi Welcome to Linux.
First, can I ask you to please keep your language family friendly? I wouldn't want to see you in trouble with the moderators before you even begin.
As long as the hard drive you're using isn't locked or encrypted by another computer, it should work well enough. (we can never be certain until we've tried though)
Linux .iso files are already bootable. Those apps that create a "bootable usb" are designed for Windows install disks. What you need is to do a low level copy of the .iso file to the usb drive.
Unfortunately, I do not know how to do that from Windows. I normally use dd for this from Linux.
If you do have access to a computer that is already running Linux, I can help you do this.