When I am using my Windows based programs the screen jumps around - don't know how to describe it but it just jumps around on its own. When I try to select something, the screen just keeps flitting onto one thing after another without allowing me to get to my actual selection. In other programs I cannot utilize all the function and the same instability happens within the programs - for instance, the zoom takes off going up & down on its own - I am not touching anything.