Sorry to be offtopic, but computers can do things wrong. Trust me, I am in IT too ...
Firstly, you will know as well as I do that those errors that occur are almost always down to human errors in source coding. I do not do avionics (and looking at mike-wsw's profile he apparently did - so he should have known better) but I know that they are highly customised embedded systems, with levels of certification, testing and criticality many times higher than normal. It is, for all intents and purposes, impossible for any safety critical bugs to make it through to aircraft in revenue service. The levels of redundancy (The A330 has three FCC's) further reduce the likelihood of software failure causing a catastrophic event such as this, and comments like the previously mentioned poster's do nothing but provide fuel for the hysterical, uninformed drivel bandied about regarding the safety of FBW aircraft - Airbus in particular.