Cybersecurity Alert: 50% of Windows PCs Remain Vulnerable to Attacks

In a stark warning issued by the UK’s National Cyber Security Centre (NCSC), it has been revealed that approximately 50% of Microsoft Windows PCs remain vulnerable to cyber attacks due to outdated software. This alarming statistic affects an estimated 350 million of the 700 million global Windows users, emphasizing the urgent need for system upgrades to mitigate potential security risks.

The NCSC's advisory comes in light of Microsoft's recent decision to extend support for Windows 10, which many users perceive as a reliable operating system despite its age. Windows 10, released over a decade ago, is no longer being regularly updated with security patches, making it an attractive target for cybercriminals.

Dr. Sarah Johnson, a cybersecurity expert and Professor of Computer Science at Stanford University, states, "The reluctance to upgrade to Windows 11 not only exposes users to known vulnerabilities but also makes them susceptible to sophisticated attacks like ransomware, which thrive on outdated systems."

Microsoft's initial plans to phase out Windows 10 by October 2025 have faced user resistance, particularly as many individuals do not have the hardware capable of supporting Windows 11's requirements. According to a report from Statcounter published in July 2025, Windows 10 is still installed on more devices than Windows 11, indicating a significant portion of users have not made the transition.

The NCSC highlighted the significant risks associated with remaining on Windows 10, referencing the WannaCry ransomware attack of 2017 that exploited vulnerabilities in outdated Windows systems, resulting in billions of dollars in damages worldwide. "Devices that do not meet Windows 11 hardware requirements remain fundamentally vulnerable to attack," the NCSC noted in its advisory.

While Microsoft has reiterated the importance of the upgrade, citing enhanced security features in Windows 11, many users remain hesitant, with economic factors playing a significant role. Senior Vice President of Microsoft, Tom Warren, mentioned, "We understand that not all users can afford to upgrade their hardware immediately, but the security benefits of moving to Windows 11 are substantial."

Experts suggest that user inertia is currently the biggest threat to Windows security. As the deadline for full support of Windows 10 approaches, cybersecurity professionals warn that the risks of remaining on outdated systems will only increase. "The biggest challenge is changing the mindset of users who believe their current system is sufficient," added Dr. Johnson.

In conclusion, as the cybersecurity landscape continues to evolve, the implications of remaining on an unsupported operating system like Windows 10 could have far-reaching consequences. Users are strongly urged to consider the benefits of upgrading and the potential risks involved in delaying such crucial updates. The next few months will likely see increased efforts from cybersecurity agencies to encourage users to make the necessary changes before it is too late.