Debug messages: basic questions

Last week, running Vista, I began seeing "debug" windows with various line errors pop up whenever I would navigate to "Yahoo" or "Google" and sometimes other websites.  Same with my machine at the office, running XP.  My friend told me about a debug virus, so I don't know whether or not the messages are legitimate or I am infected. I've tried searching here and other places, but still can't tell.   Norton 360 is active on both machines, but detects no problems.

 

Help?

 

Last week, running Vista, I began seeing "debug" windows with various line errors pop up whenever I would navigate to "Yahoo" or "Google" and sometimes other websites.  Same with my machine at the office, running XP.  My friend told me about a debug virus, so I don't know whether or not the messages are legitimate or I am infected. I've tried searching here and other places, but still can't tell.   Norton 360 is active on both machines, but detects no problems.

 

Help?