To do the zoom in and zoom out at photoshop, you need to hold your Alt key and then scroll your mouse wheel. Based on the wheel moving direction, image will be zoomed in and out.
You are not the first one who is facing a problem. That's why I always share the solution of problems on my blog those I have faced. I believe someone will find that solution helpful. As I am a programmer, I use to do freelancing more or less and I encounter lot of technical problems when I work. I simply write up those as an article here. I have also placed Google Ads on my blog, so that I can convert my visitors into money. Its not a big amount, but still something is better than nothing.