Well firstly from me also, great choice on getting NOD. Certainly the most AWESOME AV anywhere ever!
In IMon click setup and go to the Misc tab - you should find most of the options you need for alerts etc there.
Otherwise, under system tools, which must be double clicked to open the menu below, click nod32 system setup. Then what you need to do, is, in the right hand pane click setup and you should be on the general tab. Now click on the option to enable silent mode. What this will do is to only alert you to things which need user interaction.