yes because because the files could have been burned form the disk to the computer coppied then put up for download in a file download website example:adfly
RAM drive
yes
If you do not have Windows 7 on a DVD or have not made a back-up of 7, or do not have the hard drive partitioned with 7 saved on that partition, you are out of luck.
Windows can not use ISO images without additional software.
yes
download it
No.
dvd
Downgrade it, you can use a Windows XP install disk to undo the Windows 7 one.
It must be a Dynamic disk, not Basic.
Getting around a windows 7 password without using any recovery disk will take a lot of computer skills to do it. Considering using any recovery disks tool in the market,Password Recovery Disk For Windows 7
Windows 7 and Windows XP are operating systems. You cannot format operating systems. But you can format your hard disk or hard drive. You can use Windows XP bootable CD to format HDD, but you will have to use Windows 7 Bootable Installation disk to install OS on your formatted drive.