How To Reset Local User Account Password Windows XP, Vista or 7

All you need is just a USB stick. Can also use CD but its kind of waste because the file size is not more than 10MB. First download the boot file. USB. CD. Floopy(this is super old-school). If using floppy you might need this drivers. PATA/SATA. SCSI.

How to make the CD

Unzipped, there should be an ISO image file (cd??????.iso). This can be burned to CD using whatever burner program you like, most support writing ISO-images. Often double-clikcing on it in explorer will pop up the program offering to write the image to CD. Once written the CD should only contain some files like "initrd.gz", "vmlinuz" and some others. If it contains the image file "cd??????.iso" you didn't burn the image but instead added the file to a CD. I cannot help with this, please consult you CD-software manual or friends.
The CD will boot with most BIOSes, see your manual on how to set it to boot from CD. Some will auto-boot when a CD is in the drive, some others will show a boot-menu when you press ESC or F10/F12 when it probes the disks, some may need to have the boot order adjusted in setup.

How to make an bootable USB drive

Copy all the files that is inside the usbXXXXXX.zip or on the CD onto an usb drive, directly on the drive, not inside any directory/folder. 

It is OK if there are other files on the USB drive from before, they will not be removed.

Install bootloader on the USB drive, from command prompt in windows (start the command line with "run as administrator" if possible)

• X:syslinux.exe -ma X:

Replace X: with the drive letter the USB drive shows up as (DO NOT USE C:)

If it seems like nothing happened, it is usually done.

However, a file named ldlinux.sys may appear on the USB drive, that is normal.

It should now in theory be bootable.

 Please know that getting some computers to boot from USB is worse than from CD, you may have to change settings, or some will not simply work at all. If using Windows 7 please run CMD as administrator.

How to make the floppy

The unzipped image (bdxxxxxx.bin) is a block-to-block representation of the actual floppy, and the file cannot simply be copied to the floppy. Special tools must be used to write it block by block.

• Unzip the bd zip file to a folder of your choice.
• There should be 3 files: bdxxxxxx.bin (the floppy image) and rawrite2.exe (the image writing program), and install.bat which uses rawrite2 to write the .bin file to floppy.
• Insert a floppy in drive A: NOTE: It will lose all previous data!
• Run (doubleclick) install.bat and follow the on-screen instructions.
• Thanks to Christopher Geoghegan for the install.bat file (some of it ripped from memtest86 however)

Or from unix:
dd if=bd??????.bin of=/dev/fd0 bs=18k

After that boot from you respective device and follow simple instruction.

credit to http://pogostick.net.