K.,
At 17 months, children are exploring their world. They are by nature, as we all are, touching beings. They don't understand that there are certain things that are off limits to them. We learn what to touch and what not to touch through our parents, yet we continually attempt to see what the world is about even though we are told, "No." It's not easy to keep guidance over a toddler, but you might try a couple of different things.
The first would be the obvious one which is to remove any and all objects that you can from the area she plays in (room, main living area, etc.) that is not allowed.
The second would be to offer her other choices. If, for instance, she is going for the computer, you might say to her "The computer is not a choice right now, but we can play with this toy or that toy. Which would you most like to play with now?" Even children as young as 17 months understand choices and enjoy working with Mom or Dad because they like it when you are happy.
The third would be to put signs, such as a crossed out hand, on the things you most don't want touched. If you find you have too many signs, I again suggest you remove some items from your home or room she plays in for the time being. You can always bring them back when you feel she is older and ready.
As she gets older, she will learn to ask before she touches certain things that would will eventually approve of, such as playing on the computer. You may even set up computer time where you remove the sign when it's time to sit at the computer with Mom. When the sign goes back up, it's hands off.
You're doing a great job K.. You are blessed with a happy child, but you are clearly doing things right for her to be smiling everyday. Don't worry, we all wondered about better ways when we were raising our first child. I have 6, the last ones twins. I'm still learning.
W. P.