Operating systems generally do not offer the possibility to uninstall themselves. Mandrake Linux is proud to offer you the liberty to do so.
The uninstallation process consists of two steps:
Delete all partitions on your hard drive and replace them by a single FAT partition with DiskDrake.
Uninstall the bootloader (generally grub) from the Master Boot Record (MBR). To do so, boot under DOS and run the fdisk /mbr command.
If you have another OS, please consult its documentation to determine how to perform the same step.