Friendly reminder: NEVER use the “red X” button when you suspect malware or adware in a pop up, or in your browser. Instead, use keyboard combination “Alt F4” (without the quotes)
The reason is simple, developers of malware craft in button look-a-likes, to make you think you are clicking on things like “close this window”. In reality, they have crafted malicious actions underneath that little red X.
To see more keyboard shortcuts for your operating system, CLICK HERE (select your operating system on the right side drop down box)