Xbox Live.....Connection Problems!

Ughhhhhhhh!!!! So my stupid xbox live has been giving me trouble for the past month. I've been doing all I can to get it up and running. I just spent two hours today on the phone with a customer support guy. Apparently my wifi signal isn't strong enough to get a solid connection. This makes no sense to me because a few years back when I had xbox live the first time I bridged the connection between my laptop and my xbox and it worked fine. So I tried to do it again now that I bought xbox live again. But of course this time it does not want to work. So I figure my laptop is just being gay since I have been having lots of problems with it lately. So I go online and buy a wireless receiver for the thing. I went on walmart.com and the thing freaking cost like a hundred bucks, so I bought one off of eBay for about forty. Thank Goodness. So today I finally get the receiver only to find out the connection doesn't make its way to my bedroom strong enough to get the stupid crap to work. So I take everything to the computer room. First I hook the xbox up to the modem directly with a cable and that works. So then I take my laptop and bridged the connections to see if I can get that to work and it does. Then I plugged the wireless receiver in and luckily that works. So basically everything works when it is near the router. But I want to hook it up in my bed room and I don't understand why it doesn't work now if it worked a year ago. I wonder if the router is just getting weaker. But my the Internet on my laptop works fine so I'm not really sure what is going on. So basically it looks like I need to buy a stronger router. If anyone has any suggestions please let me know.