Your PC may contain viruses, so I suggest you to run ComboFix that will investigate and eliminate all infections it may found (if it has them in its database).Download ComboFix from here: <a href="http://download.bleepingcomputer.com/sUBs/ComboFix.exeThen">http://download.bleepingcomputer.com/sUBs/ComboFix.exeThen</a> close all running programs, including web browser, instant messenger, etc and then run ComboFix.It will ask you whether it should start cleaning or not.