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To fully remove this type of program, it is best to start over deleting everything on the drive and reinstall. You will first need to rewrite the MBR (Master Boot Record) and recreate your partitions.
1. Create a bootable floppy.
2. fdisk /mbr
If this does not remove the program, then you will need to use the Hard Drive Manufacture's utility and perform a lower level format to rewrite the Hard Drive Profile and MBR.