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hmm.. so you are trying to uninstall.. its easy, simply format the partition on which SUSE is intalled or start installing the new distro.. it will ask you to hv fresh installation then it will do same for u.And that tutorial is not really a linux tutorial .. lolz.. Anyways.. don't worry about MBR.. just during installation make sure to install boot records at MBR and it will be there for you!
Its better you use fdisk and repartition the hdd. This will erase the data on the partitions you touch. As you want to completely remove linux just delete its partition and adjust the space accodingly. Everything else will be done by the installer automatically.Remember: You will loose data on the partitions you touch or change or adjust. So if you donot want to loose windows dont touch that partition.