DOS, which carried out a distinction between hard disk

I used a friend's computer is WINDOWS-XP version of the Chinese Family (2002), the latest system does not work fully, open interfaces, there is no word icon, but can not read disc (garbled display 1111111111 ,,,).Read on-line experience from his successful re-DOS system installed! To the Internet.However, there is always an error message that the installation software could not open the site show that there are always prompt and ,,,,,,:disk space, disk C is found only 108GB, can be used 44,9 GB; D disk 1,48 GB, can be used 0 bytes! (WINDOWS some documents are set in D).
from DOS, I would like to carry out the redrawing of the hard disk, what should be done?
errant Thank you!

fdisk