you may need to install intel chipset drivers for your laptop mb to work right. (if it uses intel chipsets).
if your lucky your laptop drivers are in a system or restore partion on your hard drive. if you did not delete the partion you may be able to go into it and look for a folder called drivers. the not so easy way is go to the ethernet driver that missing and under the device info you get a long string of letters and numbers called device id you can google that info and find the vendor of the ethernet chipset and download the driver from them. a lot of people use intel hardware scan that free on intel web page it give you the hardware info you need and may help you find your missing drivers.http://www.intel.com/p/en_US/support/detect