Common problems
Pop-ups, warnings, or a virus
Fake warnings, browser pop-ups, and a homepage you didn't choose usually mean adware or malware got installed along with something else.
Signs
Pop-ups even when your browser is closed; a "your computer is infected, call this number" screen; new toolbars or a different search engine; friends getting odd emails from you.
Try this first
Don't call any number in a pop-up and don't pay anyone who contacts you. Close the browser (hold the power button if you have to). Change your email password from a different device.
What we do
We remove the malware, check for anything that lets it back in, update your security, and show you what to watch for. We can often do this remotely.