Hi Almighty1, welcome to the SF.
Normally when installing another version of Windows, regardless if it has Update or not. It's recommended to backup all important documents etc, then install a fresh copy of Windows 7.
1. Check The Installed NIC Driver.
Okay we will need to check to see if the correct NIC driver is installed.
Click on Start > Control Panel.
Click on Network and Internet link.
Click View network status and tasks link.
On the left side, click Change adapter settings.
Right click on the Local Area Connection and select Properties.
Now under the box "Connection using:" click the Configure... button.
Click on the Driver tab and check that the correct network driver is installed.
2. Is The NIC Conflicting With Other Devices?
Click on Start > Control Panel.
Click on Network and Internet link.
Click View network status and tasks link.
On the left side, click Change adapter settings.
Right click on the Local Area Connection and select Properties.
Now under the box "Connection using:" click the Configure... button.
Click on the Resources tab. Check that nothing is present in the Conflicting device list.
3. I'll need you to run Command Prompt (run it as administrator)
type in ipconfig /all >>C:\ipconfig.txt
Then attach the ipconfig.txt to your post.
That way I can see what's going on with your network connection etc.