@joney As I always say, some more info would be nice. Just the windows not working doesn't tell us anything about the starter, even if it isn't a bad switch. Notwithstanding everybody else's wiring recommendations (which will be helpful to refer to, IF that is the problem), let's break it down and cover what you haven't told us - what electrical functions do and don't work? Try the headlamps with the key off, then turn the key to Key-On-Engine-Off but don't crank. Will the windows work with the new switch? Does the radio work? Cabin lights? Electric mirror adjustment?
If it's the battery connector or cable, when one thing doesn't work, every thing shouldn't work. If it's a relay, things on the same circuit would be affected (source wiring diagram on EF or refer to owner's manual, if you have one), but things on other circuits would be unaffected.
To help you understand wiring, electricity is exactly the same as plumbing. If you shut off the water to the bathroom, the sink and the shower won't work. If the water is on and the sink works but the shower doesn't, you've isolated the problem. So, if for example your headlamps work but your fog lamps don't, since they're both run on the same circuit, you know the problem is with the foggies. The wiring diagrams will tell you which devices run on which circuits.
Before you go looking up wiring diagrams, a good look at your fuse panel and relay box for any loose or blown fuses would be a good start. Even if they all look good, replace your starter fuse with an other of the same color - a bad fuse may not appear to be blown.
Incidentally, if it is a burned out or disconnected starter, that's an easy fix (assuming you have a ride to a parts store). You can replace it without jacking up a stock model (done it once). I do know that some others have had issues with the starter wires coming loose or breaking; it's not hard to access, but BE SURE you disconnect the battery before you go and mess with it. I don't always, but you should.