I would find it interesting to see how many error messages show up in your event viewer, on average, each day.
I can get a lot when I am installing/configuring new hardware or software, and most of my error messages get generated on each start-up. On average when things are running reasonably well I still get 10 or 12 a day. Most (all?) of these don't seem to cause any problems for me.
In any event - how many do you get?