After you start the k/ubuntu live-cd, go to applications-accessoires-terminal
Disconnect all usb drives.
Type "sudo fdisk -l", and copy and paste the output here. (use code tags)
copying in the terminal is either ctrl-shift-c or right-click: copy
Copying and pasting anywhere else is the same as in windows.
If you see two harddrives (hdax and sdax then it's a problem with the installer. If you don't see them then the sata controller of your motherboard is not supported by linux for some strange reason. If you do a google search for your mainboard model + linux you should see if that's the case.
-- just to make sure: windows does recognize the sata harddisk? When in doubt (from windows) type: win-r discmgmt.msc that should take you to the diskmanager, if I remember correctly.
For the next time, try to include a little more information.
Welcome to the board!