In order to install Linux-Mandrake onto a drive that already contains Windows, you will need to resize an existing Windows partition to make room for Linux. This step can be performed within the installer.

But before installing Linux-Mandrake, it is strongly recommended that you run ScanDisk and Disk Defragmenter from within Windows on the drive.

And as always, back-up data you cannot afford to lose before installing Linux-Mandrake.