change my administrator password without dvd?

Download Ophcrack, burn it to a CD, reboot and boot from CD drive.

If that doesn't work, download Offline NT Password and Registry editor, burn it to a CD and reboot and boot from the CD drive. But keep the instructions online handy because this program is not user friendly.
 
Reboot
Tap F8 key as its booting
login as Safe mode
Change Admin password
Then Reboot using the new Passord
 
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