I suspect you are dealing with malware, so I suggest you download and install
HiJackThis. It s a free download. Install it to its default location, close ALL other open windows and click the "Scan my computer and save log file" button. The file will save to Notepad. Copy the entire log file and paste it here in a reply to this thread. The HJT log will provide information which will allow us to understand just what is going on and advise you accordingly.
DO NOT FIX ANYTHING!!!
One of the few members qualified to evaluate the HJT log will get to it and advise you on what steps to take next. There are not many who are qualified to do this, so be patient.
Raybro