Just out of interest, have you done a check on available Wi-Fi connections your comp' detects in your area?
I have 4 neighbours using Wi-Fi Modems I can detect from my lounge, if I walk along my road with my LapTop I can detect more of them.
If you cannot detect any, then you're safer from being Hacked than myself.
I'm needing to upgrade from Dial-Up, to BroadBand. The supplied Modem is only WiFi so I'll be in a similar situation to you soon.
It is possible on some units to set it so it does not "Broadcast" thereby "hiding" your Wi-Fi signal from others.
Hope this helps?
Regards James Watt