Internet connectivity problem (help please)

Hello if someone can help me with this itd be much appreciated.

We have wireless dsl through verizon. via a Router etc…the strange thing is the main computer which is directly hooked up to the router is getting full internet while the one in my room via a adapter is not. Both the power and net lights were flashing but I noticed the net connectivity light on the adapter is off then flickers sometimes and Ive had it connect once but it couldnt fully (yahoo wouldnt show up) Now Ive unplugged the router etc as Ive been told and it usually fixes it but so far it hasnt.

what could be the issue?

Do you use a firewall in this particular computer?
Do you use a particular proxy application (like an annonimizer)?

Oh, is it related to avast or not?

Do you have your ssid set up in the router and also in the wireless computer?