You can easily reload the factory image for Windows 10 yourself.

http://www.dell.com/support/article/us/en/19/sln297920/reset-or-reinstall-windows-10-on-your-dell-computer?lang=en

Thanks for your answer but I already tried that and it didn't solve the problems. I assume this is because my laptop used to be based on Windows 8.

If it was upgraded to Windows 10, you can also download that and reinstall it. It likely will fix the WIFI problem, but you're likely to need a new keyboard to replace the other issue.

There's no way you'll get Windows 10 installed by a shop or servicer for free -- if you can't or won't do it yourself, just about any computer repair shop will do it for you -- for a fee.

To get the install ISO for Windows 10, see

https://www.microsoft.com/en-us/software-download/windows10

Okay then I'll try it again and if it still doesn't work I'll consider contacting a technincian. Thanks for helping out!