I just reformatted by mum's computer and now I'm having trouble connecting to the internet (the modem and all has been left plugged in since before I reformatted it so nothing should be wrong). The other laptops in my house are working fine in terms of the internet, one runs on windows 7, and the other is a mac. I went to Network Connections and there's no option to choose; as in not a single network is showing. How do I connect to the internet without affecting the other computers in the house?