Custom Scroll Settings

So before i would be able to use my scroll wheel for several different things.

for example:

ctrl + scroll = zoom in or out

normal scroll = scroll up or down (like in a web browser)

shift + scroll = scroll sideways

i loved these settings and it really help my workflow.

But then stopped using photoshop for months and today when i came back the settings were changed...

i dont know how they changed, im using cc15

can someone tell me how do i reset the exact settings i mentioned back.