I don't know what you changed in the registry, but you can try this and it will hopefully be of some help.
First open the run box by hitting
Windows key + R and then type
regedit to open the registry.
Then navigate to the correct network adapter by going to the registry location
Each network adapter will have a different hex subkey that looks like this. Registry hex subkeys
From this point on, I don't know what DWORDS and string values you have.
Check to see if you have a DWORD (blue icons) that is called
EnableDHCP. If you do, check and make sure that the hex value is
1. If it has a value
0, change it to
1 and restart your PC.
You could also put a screenshot of what your registry values look like for the network interface. It may make it easier to see what is wrong.