good to see security advice threads in the newbie section. you can never be too paranoid when it comes to IT security, though there are some thresholds most people have to draw the line at, for practical purposes, as a few people have reiterated in this thread.

most people, unfortunately, will never be certain that the device(s) they use are secured/uncompromised. it's a risk everyone has to decide whether or not to take in order to utilize the electronic tool(s) at their disposal.

if you think you have to be paranoid now...just wait until the singularity emanates and we have the ability to jack into networks and systems directly with our minds.