Download Eset Online Scanner, once down....boot up into safe mode and run the eset online scanner and let's see what it finds. Free Virus Scan | ESET Online Scanner | ESET
Since the damage that's been done is extensive and a system restore or system repair might not work. I would suggest a complete factory reinstall if an OEM or a clean install if you have a retail copy.
Natively, I don't think that's possible. You would need some 3rd party software for that. Stardock has something that will allow you to group open windows together and move around as needed. I think it's called "Fences" but not sure.
By default, when you plug in the ethernet cable it will disable the wifi. Also, you should have a wifi FN Key on the laptop to turn on/off the wifi or a specific wifi on/off button/key. With out the make/model of your laptop....it's hard to say.