Do you have anything on your laptop worth saving?
If no and you’re happy to wipe the laptop, then hopefully the Windows 10 server recorded your serial and registered your laptop.
Download any program to find your windows 10 key. Write it down.
Then download the correct version (of Windows 10 e.g. Pro 64) of 10 from Microsoft onto a USB key..
Use USB key and reinstall 10 fresh not by repair.
Make sure laptop boots by USB on bios.
If you wNt to stick with 7, Ethernet cable and Windows update for your drivers.
Or go to laptop manufacturer and download the correct wifi drivers etc.