Vista - Limited Connectivity via Wireless.

My issue is that I'm at home from college now that its the summer. Normally whenever I'm home with my laptop my wireless works fine. This time around it doesn't work. Every time I connect it doesn't show that there is limited connectivity but sometimes when I disconnect and reconnect it shows. I remember before that in my Networks and Sharing Center that I was connected to multiple networks of the same thing. Now I am connected to only one. I've tried many different things by searching online and various other things but no matter what I do I can't fully connect and do important things. Any suggestions to what is wrong or how to fix it?

Have you made sure there isn't a firewall blocking you and have you made sure that you've entered the key correctly for the security in the router.

I take it you are trying to connect via a router ?

Yes the firewall is down and the key is entered correctly. This isn't a new thing because I've always been able to connect to the wifi and now it went from multiple networks of the same to only a single one and limited connectivity.