Engineering mainly focuses on creating or improving processes or products.
Information Technology deals more with the networking and software aspect of computers. i.e. The movement of information using modern technology, hence the name. (At least from what I gather from observing the IT department here at uni)
Wikipedia entryIf you wanted to repair computers, you would want to get a degree in Techie-ness. Or a degree in computer science. Whichever you prefer.
Your title and your first post together confuses me as to what you are doing in college.
If you are in engineering, then yes, your first year (as year 2) will mostly be comprised of higher level math and physics courses, and low level engineering, such as statics and dynamics, circuit analysis, and others. Your final two years will be mostly in your area of expertise. (me being an industrial engineering major)
If you're going into IT, then you'll still mostly deal with the higher level math and physics courses your first year. But then I would assume you'd learn more about different types of software, data management, and the capabilities of networking more than fixing a computer. (Not saying that it couldn't be a side job)
But like Taipan said, YouTube is probably the best way to learn how to fix computers, or to at least give you an overview of what you may be doing.