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Richard we all need more information to work with
4g are you referring to mobile data on a mobile phone network. Richard ?
Setup what are you trying to setup a USB Dongle or are you connecting via a mobile phone ?
Or are you using a 4g mobile data wi fi modem hooked into each device via wi fi ?
what operating system is on your laptop ?
Fot that first you need wi fi router with intenret connection .
Then check in your laptop that your wi fi network adapter driver are installed.
Also check its wi fi switch is turn on it is on laptop.
Check your wireless in router is enabled.
also check your wi fi network adapter is enabled in your LAPTOP.
Let me know if you want to configure your router and if you need more assistanse .
find wi fi driver for your d257 use serial number or model number. You may need to open cover on bottom of laptop to see which rf board is being used in your laptop as I found a aod257 but it had three possible wi fi drivers . but aod257 may not be your model number.
select the correct operating system in the web page
Well you have formatted the system, so you need to install the Wi-Fi driver in order to access the Wi-Fi.
ou must be having the driver CD, If you dot have just download the wi-fi driver from internet and install it on your Laptop and re-start the laptop and you will be able to access the Wi-Fi again.
First make sure that wi fi switch of your laptop is turn on. Then check that wi fi netowkr adapter driver is installed perfect and enable. Go to device manager and enable wi fi adapter. For check device manager right click on my computer icon then click on property then hardware ->device manager. Then you see all driver list. Then enable wi fi . Also right click on my computer places icon then go to proeprty then you can see your network adapter right click on wi fi adapter then click on "view available wi fi networks." then connect your wi fi . Let me know if you need more assistance.Thanks.
In The system status indicators the wireless status light in the front of laptop Under touchpad must be lit to confirm WIFI activated. If not active switch On (FN + F5). Then You can configure your connection