uninstalled sane & scanner app in fc17, lost 80% of system

I uninstalled the SANE drivers and HP scanner apps [because I'll never use a scanner on this PC] and now I seem to have lost about 80 percent of the installed apps, including the add/remove software app itself, nautilus, firefox, and tons of other stuff which I never would have dreamed required scanner support.

Long question short: is there a way to repair my fc17_64 installation without a total reinstall? If so how? I reinstalled xsane.x86_64, sane-backends.x86_64, nautilus and firefox but still appear to have a system with giant holes in it.

Thanks from this stupid idiot,
-F