Computer engineer has two sub-categories. Hardware engineer and Software engineer. Software engineers develop operating systems, parts of a operating system and drivers. Hardware engineers create the actual hardware in the computer.
Learning excel\word isn't going to get you anywhere. You need to look in programming with the more advanced languages like c and assembler. If you're into hardware engineering, you need to learn how to program microcontrollers and some electronics.
There's a lot more information about them I haven't given you a billionth of it, it's a massive subject. Google the terms and you should get some fairly decent results.