Problems with LINKSYS Wrt54gx2 urgent!

Hi this is my first post and I have this big problem....

I had 56k on my home but then my neighbor told me that if I bought a wireless router He would let me get internet from his house whose is 1 mbps so I bought 2 Linksys WRT54gx2 routers with srx 200 and mimo technology .. the thing is that I connected one to the modem and every led is ok (Power, internet. wireless) and he has conecction on he's laptop but then I put near outside the other router to extend the conecction range, I just plugged turned it on and the power led is on and Wan but the internet led is off and in my house I have signal ( very low) but still I can connect but I cant search or do anything on the internet , its as if I dont have any connection, and I have 17% fo signal from this router and my neighbor nex to me has a belkin pre n wireless router and I get -4% of signal but with that I can search all over the internet and download!

So can you help me , do I have to insert my router Disc ( the problem is that I need to be online with the router and the router is n my neighbor house and my pc is a desktop)

Little help her please, what did I do wrong