• You need some form of virus protection for all your computers.
  • Most routers have a firewall, if yours does not, install one. Firewalls will help protect your network from worms, viruses and outside attacks.
  • Install some sort of basic network traffic monitors. While you don't want to invade your customer's privacy you do want to keep an eye out if one of your customers is using your legitimate business to send out spam.
  • You may want to block
    common p2p ports on your router. p2p programs can eat up a majority of the bandwidth and can bring a lawsuit if pirated software is uploaded from your network.
  • Do not install pirated software on your computers. You may save yourself a few hundred dollars installing one copy of MS Office on several machines but you may end up with a lawsuit costing tens of thousands.
  • The cafe computers will probably have spyware on them frequently, make it a habit to run anti spyware programs often.