Re: F 17 Upgrade Question
How are you planning to upgrade?
The upgrade will replace the boot-loader with F17's version of GRUB2 (assuming that you're using GRUB to load both OSes), but it should properly detect and add an entry for Windows as long as you don't modify the Windows partitions. If you use the pre-upgrade method, you shouldn't have a problem (at least with Windows, there are other known boot issues with F17 pre-upgrade, but they're reasonably straightforward).
If you do a fresh install of F17, just make sure not to touch the Windows partitions in the partitioning section of the installer (except to set up a mount-point of course). If you have a separate partition for /home (i.e. separate from the root partition), similarly set it to mount at /home but not be formatted, so that your personal Linux files and settings are kept.