@I had similar issue when I tried it about a year ago. It would be a good product if it was stable.
Right now I use simplewall. I also like WFC but simplewall is lighter and easier(not that WFC is difficult) I wish there was a standalone firewall thats as good as Eset's firewall.
I previously thought of using Comodo firewall module only but then CS said not to do so.
Are you talking about reinstalling Windows while installing simplewall? If so, then no.