My friend wrote me this: In any program (safari, excel, powerpoint etc. it will scroll down uncontrollably and sometimes when trying to type (for example in a search engine or a password to log in) it will type " 9.ol/ or something similar (but only using those particular characters). Also, sometimes it will just go in and out of the "window pane view" when I have multiple windows opened. It does all of this uncontrollably and/or at the same time. I remember that you told me to download all the security updates, I did this and was still having problems after. That was yesterday, and now today it is fine! What does that mean? You told me that viruses for MAC are rare, but could this be a virus? One more thing, I noticed that it started after I downloaded a large powerpoint file from someone elses USB. Could this file have had a virus?