That's all I can offer given the details so far. It's a common issue if the owner of the router used WEP or "MAC FILTERS". But the owner insists the password typed in is correct. Humor the owner and change it to WPA2 for a test and disable the MAC FILTERS.
Good luck and hopefully the owner of the router will tell more detail.
I'm writing here because I have tried more or less everything that I could. I was having issues with my computer. It was taking awhile to start up (I figured out what this problem was later), and all of a sudden one day, the internet would not connect. I had the ethernet cord plugged into my computer, yet the computer still said "A network connection is unplugged".
It was about time for me to reformat anyway, after a bunch of hardware changes, so I backed up everything and did so. When I plugged in the ethernet controller this time, it could find when the cord was plugged in or not, but it kept delaying on "acquiring network address".
After trying many different setups, I became frustrated and blamed this mishap on either the recent storms in TX or the fact that the card was just old (I purchased the computer in 2007). When my boyfriend connected his laptop to the network, the laptop found internet. Even my Android phone is finding internet. I caved and bought a wireless controller.
My computer still stalls at "acquiring network address".
This is very frustrating for me, in large part because my phone system for my business runs from the internet, along with the fact that I work a lot online. If anyone can assist to finding a solution to this mishap, it would be greatly apppreciated.