Why do I need to complete a CAPTCHA?
Completing the CAPTCHA proves you are a human and gives you temporary access to the web home.
What can I do to prevent this in the future?
If you are on an individual connection, like in your home, you can run an anti-virus scan on your gadget to make sure it is not contaminated with malware.
If you are at an office or shared network, you can ask the network administrator to run a scan throughout the network looking for misconfigured or contaminated gadgets.
Another way to avoid getting this page in the future is to utilize Personal privacy Pass. Check out the web browser extension in the Chrome Web Shop.