explain:
1- Restart the computer during startup PC (at the beginning of) Run BIOS defauld press and hold F2 or F1, F10 or ins.
2- Tuck BIOS / Boot device Priority, Enter there
3- First set to "CDROM"
4- Press F10 and save and restart
5- insert the DVD with System
6- when the message "Click any key to boot from CD" or someting, Just press anykey
7- Standard System Installation (in your case, the "D" Disc)
After the installation is complete, do not forget to change in BIOS To "HARDDISC" Launch System.