Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This product is worthless

I spent hours trying to get a topographic map on my computer. I read the instructions and clicked on every bottom in the program. All I could get was a regular map without the contour lines. I would think that a product sold as "National Geographic TOPO" would include instructions in how to view a topo map. I also had to reload the program several times.