You can pick one of these hijacks up today, in an instant!

We were loading PDF reader, and our hijack came in on that download. The computer was 2 days old!

Malwarebytes took care of it quickly and easily. It is free online.
Be careful downloading from sites however, because some have fake download buttons! This fools people and that is where many of the viruses, trojans, and malware are hidden.

We became so paranoid when this happened a couple of months ago, that we decided to get the pay for version upgrade. This after using the free one for many years. We ran a scan over night last night and it found 2 nasty objects! Usually we don't have any hits with the weekly scan we do. So I removed those this morning.

One should really run Malwarebytes once a week... there is so much junk out there now to infect you!

While Mozilla FireFox is less prone to these hijacks, Internet Explorer is very susceptible. So switching to FF may help also.
Regular antivirus programs often miss this type of malware, so you really need both types on your machine. And run them at least once a week too!