Experts are warning that over 30 million PCs running Windows 10 need to transition to a newer operating system before Microsoft halts support on October 14, 2025. Without updates, these systems are vulnerable to cyberattacks. Thorsten Urbanski from Eset advises users not to wait until the deadline and consider upgrading to Windows 11 or alternatives like Linux or Mac. A costly extended support option will be available post-deadline, but it may not be viable for most users.