1) Start => Run iexplore.exe -extoffThat command run Internet Explorer in safe mode, without any extensions. Check situation, if IE can connect to internet, you should reset your browser to default. 2) Reset Internet Explorer to default Please, read this => CLICK 3) Flush DNS cache Start => Run ipconfig /flushdns4) Run SFC.exe to fix broken system files Start => Run => cmd sfc /scannowAll broken files will be recovered. It hard to tell, many possibilities... recently updated system with bad hotfix, malware etc.