I have a NetGear (can't remember the model...).
The admin address is "http:\\192.168.0.1".
If you've never been there before, your manual should tell you the default user/pwd. Change the password right away.
Second, secure your wireless connection with WEP (or others) with at least 128 encryption.
Third, pick an SID that you will remember and select the option that says "don't publish SID"; this way, your neighbors won't even see it.
Last; go back to your client (PC or laptop) settings of the card and update it with this new encryption info. You will need to know the SID, and the passphrase of it (sometimes in Hex, sometimes in ascii). btw : to make this passphrase usefull, mix it with random letters and numbers, as well as upper/lower case. Ex : 8dhRsl382I8CDe2gk
After you set that up on both your computers, you should now be able to surf the web again. If you notice that some IM programs stop working, then write back over here, we'll tell you how to punch holes in your firewall.