Dsl modem, dlink and usb wireless adapter

Hello,

I have verizon and I currently use the dsl modem. For the last few weeks my computer stopped working and verizon said that it was because it needed a new NIC card. And so I called hp *that's the brand of my pc*and they said that they don't make any more NIC cards for my pc because its too old. And so they told me to instead buy a usb wirelss adapter. And I did. I just got it and it turns out I can't access the internet still .. because instead of a dsl modem it needs to be a wireless one. And so I bought a d_link wireless router but I have noo idea how to install it since the internet won't work. Plus... evrytime I open a new browser, 2 boxes pop up and it says "connecting to broadband connection (wan) ... and then a couple of seconds later another one pops up saying error 815: we cannot connect you to the browswer.please talk to your representative (or something like that) I need help with this. Pleaseeeeeee!!! Thanks soo muchh! Any help is appreciated.. and if you need more details I'll gladly give them to you. Thanks!