I have newly formatted netbook but its wifi does not work

Hey guys, I have this Samsung netbook that is newly formatted from being windows 8.1 to windows 7 ultimate. After I formatted it, I notice that the wifi does not work. What do I do? A little tip or help would do, tnx in advance.
 
You've Downgraded the system and reformating LOST all the MB drivers, including the WiFi

You need the make/model of the wifi chip; go to the website of the make, look for the model driver for Win/7.
 
My netbook is a Samsung and it is beautifully made. I've installed an SSD and it has the maximum 2Gb ram. When it was launched it had Windows 7 Starter edition but it's now on Windows 10. Notice that I didn't say "upgraded" because the hardware is so puny it just about copes with surfing. Downloading Windows updates takes forever. It was a mistake not to stick with W7 Starter Edition which is much lighter on resources. I am a fan of Windows 10 but got it wrong with my netbook. You should find the necessary drivers on the Samsung website as jobeard has pointed out.
 
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