upgrading f15 -> f16

view story

http://forums.fedoraforum.org – Hi, I have 500 gb hard disk initially loaded with windows 7. Later, i created a partition and installed fedora15. Now, i tried upgrading it using preupgrade. This successfully downloaded all the required packages and asked me to reboot the system. Upon rebooting I choose the option upgrade after which i got a message saying "could not find any empty partition"..... Can anyone help me out? Thanks (HowTos)