freeing up space on C drive

[kingell]

'My computer' reads;
floppy (A,
BOOT(C, capacity=55.6 gigs, free= 6.03gigs.
BACKUP(D): capacity=51.2 gigs, free =47.6 gigs.
My documents on 'C' take up 23+ gigs
which I want to transfer to 'D' without risk of
messing up; which I am likely to do without help.
Thanks,
King.