Hi Reggie and welcome to the forum!
I had the same experience when I installed Windows 7 on my machine.
The solution: Download all your essential drivers from your manufacturer's web for the latest ones.
After installing Windows 7, if it wont accept the installation automatically, extract the drivers off of the installer, of if applicable, download the zip version of it and then install the driver manually by going to device manager, right-clicking on your NIC and choose update driver and point to your extracted folder.
Hope it helps