lost my firewall files

don't know if i was hacked or what but starnge things were afoot when I logged on this afternoon. I was using brickhouse with no problems but on restart after I noticed the problems, it hung at the starting firewall part.
Noticed the firewall files are missing ( I cannot remember all of them but they were in that firewall folder) Tried a restart to see if X would just re-add them. No joy. Can I get a copy of this from my CD, will this require a re-install, what?
Help.
 
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