No, no. You don't need a Flora. I linked you to the Flora tutorial so that you could see how to open the Device Manager. The Device Manager is a standard Windows program that is not specific to Flora or Arduino.
The Device Manager tells you what devices are attached to your computer. Any device. Keyboards, mice, monitors, networks - anything
that can be attached to your computer will show up in the Device Manager
Now, all those mice, keyboards, networks, monitors, or whatever need drivers in order to work with your computer. The Device Manager program is where you can tell Windows what driver to use with each device.
Normally, Windows is able to figure out what driver to use all by itself, and you never need to know about any of this. But, for some devices, Windows cannot automatically figure out what driver to use, and that's when you have to launch Device Manager to tell Windows what to do.
The ATmega32U4 that came with your LED Belt Kit is one such device. Briefly, you connect the ATmega32U4 to your computer, and then you launch the Windows Device Manager. In the Device Manager program, you tell Windows to use the .inf file to install the driver for the ATmega32U4.
It's that simple.
Again, please look at this link, but forget about the Flora entirely. Wherever you see the word "Flora", think "ATMega32U4"http://learn.adafruit.com/getting-start ... ndows-only
After you launch the Windows Device Manager, you will not see the Flora. But you will see the ATmega32U4. I'm not sure exactly what it will be called - it may be called "Arduino" or it may be called "ATmega32U4". In any case, you should be able to recognize it easily (if you're not sure, simply unplug the ATmega32U4, and it should disappear from the list. Plug it back in, and it should re-appear. That ought to be easy to spot).
Follow the tutorial instructions from there!