Problem with mouse - left click at the same time right click?

I have a very strange problem with my mouse on my notebook (Asus). I bought a mouse because it makes me feel better, as with the "touchpad" from the notebook. It is a "Trust Optical mouse Easyclick".

The problem: When I use this mouse, a left-click (ie the left mouse button) at the same time seems to cause a right-click, ie it is possible with a left-click, e.g. Close window, but at the same time opens, for example. In the browser always the context menu. How can that be? With a right-click also opens the context menu. The mouse buttons are obviously not reversed, I have already checked the appropriate setting. The problem is only with the new mouse, the touchpad works normally.

What can you do there?

Try to update your mouse driver via the Control Panel in the Device Manager or download a driver of your Asus mouse down then everything would have to run again.