Trouble connecting to internet with usb adapter

I have a D-Link wireless usb adapter (DWL-122) that I have had for nearly a year with no problems until just recently. In the wireless preferences window it shows that I have a connection to my wireless network. However, when I try to open my web browser I get a message saying the server is not found. I am unable to access the internet in any way (itunes, instant messengers, etc.) as if i have no connection. If anyone has any idea as to what the problem would be I would appreciate any feedback. I am at a loss for ideas because as far as I can tell I appear to be connected to my network.
iMac   Mac OS X (10.2.x)  

Hi Lauren,
I was about to order the very same USB solution you are using, but then checked with a friend who's a network admin for the local diocese. He advised against this as a reliable solution & wanted me to just string a long wire. The wife acceptance factor nixxed that.
After checking the user reviews for this device on the Amazon site I found that there were many other Mac users who had been experiencing dropped connections using several different USB units like this one.
Your post doesn't say how far away from your router your iMac is positioned. Distance might be an issue for you, but not likely.
I presume you've already done the things your ISP would have suggested -- like resetting your modem, diagnosing software setup on your computer to see if anything there has changed, or repositioning the router?

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