If you haven't changed your fstab it should be OK, although some devices may be read/only.

Right Click Desktop -> Create New -> Hard Disk
In the first tab 'General' pick a new name such as 'Windows' etc. whatever you want, then select the third tab, 'Device' and in the drop-down select the proper device ie: /dev/hda1
Now you will have a KDE mount/access icon on your desktop.
All hd devices and mountpoints listed in your fstab should be available from the drop down window in the device tab of the ' Hard Disk ' desktop icon. Are all of your devices ie:
/dev/hda6 /
/dev/fd0 /floppy
/dev/cdrom /cdrom
/dev/hda1 /mnt/hda1
/dev/hda3 /mnt/hda3
/dev/hda5 /mnt/hda5
listed in the drop down window in the " Device " third tab?

Also make sure all of the mountpoints exist, ie: /mnt/hda1 /mnt/hda3 etc.

rock