Make sure your browser is set to block pop-up windows and not to reopen the previous pages when it starts. Microsoft recommends using its newest Edge browser if you use Windows 10, but if you do not care for that program, other modern browsers can block malicious sites — or work with add-ons that do. Google’s Chrome browser has built-in tools in its settings area for removing ads, pop-ups and malware.
Microsoft, Apple and the Federal Trade Commission have information on their sites on how to spot and report tech-support scams, as does the Better Business Bureau. As always, never call a telephone number listed on the alert or supply information to the pestering site.
Personal Tech invites questions about computer-based technology to email@example.com. This column will answer questions of general interest, but letters cannot be answered individually.