Laptop with WIndows 7 Won't Connect to Internet......

Hi! I'm new to the forums here. For any advice anyone has, thank you in advance!!
Okay, here's what's going on. I purchased a refurbished PC laptop that runs on Windows 7 a short time ago. For awhile I had just been a Mac user. I decided to get the PC because I like playing the Sims games, and, as they didn't seem to work on my Mac anymore, I decided to get a PC mainly to play the game on. N ow, I do have a little spot on the laptop that tells we that the wifi receiver in the computer is turned on. I get a list of available networks to connect to. (I have a network that I use already for my Mac and that's the one I try to connect to for the PC). I'll get something that shows the computer is connected to the network but apparently it's not connected to the internet. I'm at a loss here.
P.S> I'm really sorry but I was unable to download the free SysInfo Utility as the computer I'm currently on is not the computer I'm having the issue with).

 

THank you! I've resolved the problem and now have an internet connection on the laptop!!