MATTsoft Boot Manager - http://www.penguin.cz/~mhi/mbtmgr/ - documentation

3. Removing MATTsoft Boot manager

Deinstallation is very simple. From main menu choose "Uninstall MBTMGR" and confirm. Isn't it easy? This will remove MBTMGR menu from your hard disk and FAT MultiLoader from all DOS drives. DO NOT FORGET that you will be able to boot ONLY ONE operating system after uninstalling MBTMGR.