Some very good points.

If it were work related, I would definetly tell the person they are wrong. Especially with all the privacy information stored on most of these computers.

This is more, off work topic, between co-workers. (sorry, should have been more specific, my fault)

Say you and I work together, and you can't get something working on your computer and you talk to him, and he gives you advice, but I overhear from my cubby. If you were you (?) would you want me to correct the person giving you advice during the conversation or prefer to hear about it later?