Multiple choice general knowledge math & puzzles Which is the most common way for a virus to enter your computer? Entering a web address E-mail attachments Pressing refresh too many times None of these Reveal answer Fill a bubble to check yourself B Correct answer Explanation Email attachments are the most common vector for computer viruses. When a user opens an infected file attached to an email, the malicious code executes. Simply visiting a URL is generally safer, though not entirely risk-free.