After you installed a Windows 7 on your PC, you will noticed that almost nothing works. You cannot connect it to the internet, you cannot use Wi-Fi and in some cases a computer doesn’t even have sound. A few years ago, when you bought a PC you got a CD with all driver needed for that particular computer. Now, sellers just tell you to download drivers from the internet. Because your computer cannot be connected to the internet, you will have to download LAN or Wi-Fi drive on another PC. When you are done, install it on your computer. Remember to choose the right computer model and OS (32 bit or 64 bit).
1.    Connect your Pc to the internet. 
2.    Right click on My Computer. 
3.    Click on Device manager. 
4.    Items with ! need a driver.
5.    Right click on it and select update driver/search automatically for a driver.
6.    Do this for all items.

In many cases this cannot work. A PC cannot find and download drivers. In this case, you will have to download drivers manually. Go online and visit an official website of your computer (for example: Dell, HP or etc.). Go to the driver section and choose the drivers you need. If you cannot find them. Type the model of the item you need driver for (NVidia FX and the model number or etc.). You will go to the website of the manufacturer. Download the driver and install it. 

In order to work, a PC requires drivers for: graphic card, Wi-Fi, LAN, sound, mouse and keyboard and motherboard.