gwapito :
If all network drivers are gone, theres no way for you to connect to the internet either by wifi or ethernet cable. Use a friends computer to download and save the dirvers into a usb drive
Not true
That is true, if there are no network drivers, hooking it up to the wall won't do anything. If Ethernet drivers are there but WiFi is not, then yes that would work.
After a format there is a good chance that neither wired or wireless card are working.
Use a second computer, go to Lenovo's site, find the computer model there, download the Chipset, Ethernet, Wireless, Video and Audio drivers, stick them on a USB drive and install on the laptop.