IE opens multiple windows unexceptionally. All windows show home page, that is, 'about:blank'. Before opening of the windows the system works slow and task manager shows many 'iexplore.exe' processes running and all windows open at the same time. The opened IE windows are above ten. When any webpage is opened in Internet Explorer, it changes to 'about:blank' automatically and repeatedly. When any webpage is opened in Mozilla Firefox it changes to 'http://www.google.com/firefox'. I scanned with Nod32, Malwarebytes Antimalware, Windows Defender. They all say no infection. I herewith attached hijack this log file. Please help me to overcome this problem.