To completeley remove fedora and get the space back for your existing windows install you need to do the following:
*Backup any important data on your windows install first.*
Go to the gparted website and download the live cd. Boot into that and run the gparted application.
Delete the linux partition then select the windows partition and increase it to fill the free space.
Write the changes to your disk
Follow the instructions on the link Gromit gave you then boot back into Windows 7.
It will detect that your disk is damaged (which its not, its just confused because its got a larger partition than it expected) and repair it. Let it run and reboot as many times as it needs to, eventually it will boot back into linux.
If you don't want to do the above:
Backup all your important data from windows then just reinstall windows, repartitioning the disk so all of it is used by the Windows install.