I normally use Eset Firewall and Anti Virus, but Ive just gone windows 7 and I cant get hold of a decent version thats activated 
I can get just the antivirus but my router firewall is non existant, and one recomend a good interactive software based firewall program?

I can get just the antivirus but my router firewall is non existant, and one recomend a good interactive software based firewall program?