The result of my ecg lateral wall ischemia occ. pvc anterior septal infarct. whats is that mean? is that serious?

Concerning: How old are you? You need an echocardiography to see your heart or a stress test with imaging (nuclear stress test) for further evaluation. Pl get to see a cardiologist through your family doc.

By Computer?: It depends on whether a computer or a human being generated that answer. Computers are notorious for putting false readings on ecgs and they should never be relied on. If a cardiologist provided that reading, i recommend further discussion with them or another cardiologist for eval of your specific situation.