hi,
i have recently installed Mandrake 10.0 alongwith Windows XP. I want to use the windows drives to access my mp3's etc. on linux. My drives are formatted in NTFS.So I am finding difficulty to do so. I want to mount all the partitions( not only C: ).

Linux doesn't see them as C or D, to linux they would be hda or hdb and the different partitions on the disks are numbered. Windows is on the first partition of my only hard disk so it is hda1 and this line in /etc/fstab mounts it in /mnt/windows

/dev/hda1 /mnt/windows ntfs ,ro,umask=0 0 0

its giving the following error:
bash: /dev/hda1: Permission denied

are you sure your windows partition is /dev/hda1 or did you just type
that because that is what was mentioned in the above post !?

whats the output of :
fdisk -l

if that above statement is true ?!

you have to create individual directorys in Linux for each partition type to mount to.

example, mnt/windows/cdrive
mnt/windows/ddrive
mnt/windows/edrive

creating as many individual mount points for as many partitions that you need to mount.
you also need to have kernel support for ntfs, i think the package is ntfs i686 or something like that. As Andrew stated, you must also allow for the proper syntax if the file system types are different, eg; for win 95 or win 98, you would set "fat 16" or "fat32", instead of "ntfs" respectively.
once you can mount each partition into it's respective mount point, then you can set the init to auto mount them at boot.

paste the contents of your /etc/fstab.conf please