When you try to close the dialogue box, it just pops up again since it is designed to loop instead of close. It appeared as a dialogue box that claimed to be from Microsoft warning you that your computer is infected with a virus that may compromise the system, passwords, and any other personal information you may have on your computer. Like most bugs that may infiltrate your system, this bug affecting Google Chrome, in particular, appeared as a phishing scam that was related to Microsoft tech support. The major cause of this problem is a new bug that first appeared in December 2018. Part 1: Why does Chrome cause my computer to freeze?
