Google Images is a fantastic way for Malware to get onto your computer. Always check the URL before clicking the image. If it seems fishy, don't click.
That being said, it sounds like what your dealing with is a redirect virus. A website/platform/host gets hacked & instead of going to the website you intended, it redirects you to one (or you get a pop-up) that tells you it's scanning your computer & you have tons of bad stuff on it. Do not click on anything, if you can't get off that site, shut down your computer. Clear your cookies, clean your computer & run a scan (in safe mode) With a redirect, there's not much more you can do about it; it's usually not on your end.