While starting your machine, go to BIOS (using F12) and change the option to boot the machine from your CD-ROM and then boot the machine from the reinstall CD you have.
Once, you have installed windows, it is quite simple to install Mandrake Linux. But, before that ensure that you have free drive space on your HD 1 from your Windows
Control Panel -> Administrative Tools -> Computer Management -> Storage -> Disk Management. If there is no free space, create some free space by releasing some space from one of your empty Windows Drive and then proceed with the installation.
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