Wifi Theft Afoot

My wife's laptop seems to have enabled someone to get into the wifi network and , I believe, they are using our wifi. I had a bit in my laptop also, like 2 copies of Teredo tunneling adapter. I reset the router off line and put in a better password. My laptop now doesn't have any of the crap hers does, but I can't seem to get it out of hers.
Is this something that can be fixed or do I need to reset her laptop?

 

You now need to change (or if it didn't have one before) set a up secure password for your internet connection, ie a router password, so that when anyone else sees your WiFi they can't connect without that password.
Your router user manual - either physically if you have it or online on that Router manufacturer website - will show you how to CHANGE or set up a secure password.
You don't ever need to reset a Windows system simply because someone else was using the WiFi connection.
But if you think that specific laptop now has Malware you need to go HERE and run the steps in the guide at the top of that forum (NOT here in this forum).

 

As I said in my initial post, I took the router off line and accessed the router. I changed the wifi password to a very strong password.

 

I am not sure what I am looking at, but hers has a lot of stuff in device manager that mine doesn't have. See pic.
Before I reset the router, I had some of it, but it is gone now. I believe they got on our wifi through her laptop.

 

What are you seeing in device manager that is leading you to believe this?
What you are seeing under network adaptors are a multitude of Microsoft virtual network adaptors called miniports, these are not malicious in themselves.

Look, the best way to check if an unwanted guest is riding your network is to access your routers interface from your browser and check under connected clients.
This will list the number of connected clients, their device names and IP addresses.
If you notice there are more clients connected than all of your internal devices, or a device you dont recognize, then you may have an issue.

Disconnect from your router, and just open a command prompt, type ipconfig (on both machines individually) and identify both of your devices along with their IP addresses.
Match these against what you find within the routers interface.

If you need a guide on doing this, let us know!

This should let you get some sleep tonight

 

TimW and Replicator, thank you for your answers. I had a unknown computer connected before I changed the wifi password and although it was gone, I was still suspicious because her Network Adapter tab had a lot more than mine does. It was bothering me and yes Replicator, I wasn't sleeping good. Thanks again.

 

On your wife's computer, in Device Manager, click View and uncheck Show hidden devices.