I have a Dell Inspiron 1545 laptop with a newly installed hardrive. My friend gave installed Windows 7 on the laptop but had no product key so I reinstalled Windows Vista from the 5 CDs given with the laptop when purchased, but now I cannot connect to the internet. I go to the network icon on the task bar and it cannot even search for wireless networks. I believe it says something about the hardware or possibly drivers (?) but I don't know. What do I need to do to be able to find the networks, be able to connect, etc..?