Captcha is blocked in all browers

Hello! I am having quite a strange problem. Sometimes captcha is blocked in all browsers for several months. Interestingly enough, I used to have this problem on google.com. But now I am not having the problem on google, but on facebook.com. When the problem was on google, I decided to use other search engines, and bypassed the problem. But now I need to open an account on facebook. Here is the screenshot of the problem:


Notice there are several straight lines...

Captcha is blocked in all browers