Post a tad short of info. Could be a virus, run your AV scanner and MalwareBytes freebie for starters.
Always pop back and let us know the outcome - thanks
How to download, install, and run the free version of Malwarebytes See response 1:
http://www.computing.net/answers/wi...Note that sometimes you can only install Malwarebytes in Safe mode - in that case, loading Safe mode with networking is required in order for it to be able to update itself.
Ignore the part about loading your latest System Restore restore point unless you did what the guy in that Topic said he did in the first post - loaded a previous restore point.