hard disk not detected winxp fam ed

[momotaro]

using the recovery cd in order to repair the 'config error' at start
but the system does not recognize my hdd??
example:
instead of having c: am having '?'
d: am having '?'
plz help!

[momotaro]

using a bootable cd am ebale to access the c drive but the ms dos command does not want to execute even if they are correctly intred!!!

example:
whene am under c:\windows\system32\
the command : ren config configold gives: use rendir to rename directories
whene i do so i get: command or filename not recognized