ClamWin Free Antivirus [Open Source-working freeware] http://www.clamwin.com/ ClamWin is a Free Antivirus for Microsoft Windows 98/Me/2000/XP and 2003.
The definition of a modem is a tool that sends and receives a signal to create a network and Internet connections. An example of a modem is a tool that lets a computer connect to the Internet.
You're confused between a router and a modem. A modem is a translator (a modulator-demodulator.) It changes one form of signals into an other. An ADSL Modem changes ADSL signals (varying frequencies) into on-off signals (the wired LAN standard).