Deleting unwanted, installing wanted, keeping needed

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http://forums.fedoraforum.org – Hello I would like to delete ubuntu 13.04, install Fedora 18 KDE on a laptop with windows 7( dual boot Fedora with windows 7). I want to keep the grub,or equivalent, boot loader (ie Linux loader not windows). I keep having issues with Ubuntu after every update. I want to try Fedora. How can I, or what is the best way to keep Windows 7 untouched, but still accessible, and replace ubuntu with Fedora? I must keep win 7 even with the many problems, because of the software not available on Linux. ---thanks (HowTos)