Warning; if you download IObit's Advanced System Care you are very likely to download with it the Yahoo Re-direct Rootkit virus. There is no indication and it's downloaded whether you download from CNet or IObit. The virus takes over all your browsers and redirects them to Yahoo. All the browser resetting in the world will not get your browsers away from Yahoo. It's very difficult to eradicate. None of the anti-virus products work. Norton Internet Security missed it and Malwarebytes, Hitman, Stinger & Spybot didn't get rid of it. If you have a System Restore prior to downloading, that might work. It did once for me. The only other way I eradicated it was to use disc imaging software and to re-install an earlier image of the disc. For me, I shall never go anywhere near ASC ever again.