Its microsoft windows xp proffessional. Intel(R) Pentium(R) M The connection is a wireless ethernet. The firewall is a windows firewall that came with the computer. The computer is used at school and at home whick the home connection is a T1. Which is cabled. At home which is an apartment it is connected into the wall so there is no modem on my end. I don't have a router so there is not one unless the apartment itself had one. Thats about all the info I know.