How Can The Rovers Survive To The Outer Space Conditions?why When You Send A Laptop In The Outer Space?

Why when you send a laptop in the outer space it disintegrates?
How could the rover Voyager 1 reach one light-year? How can the rovers survive to the outer space conditions and travel so far without disintegrating and send us information from light-years away?
What is the source of their energy?
Why only Russia and USA know how to build them and other countries don’t know?