Links and screen shots are the only way I can continue to help. The name of the thread is vague, there are thousands of threads per day.
I am more than sure there is no virus just a precaution which can happen on certain images even on my own virus detector.
You say a 'window'... again there is no screen shot. This window is likely to have come up with your anti virus program?
If you are further concerned run your virus checker but gaining some more information would be very handy. Run your virus scanner in the mean time and I am guessing you will be clear.