Update your post to include full system hardware specs and OS information.
If using Ethernet then ensure that the wireless network adapter is disabled.
Only one network adapter (either wired or wireless) should be enabled at any given time. Barring specifically known reasons/requirements for doing otherwise.
Make and model information: modem, router, or modem/router if combined.
Run "ipconfig /all" (without quotes) via the Command Prompt.
Copy and paste the full results here.