Support for Windows XP operating system will end today.
This will mean an end to security updates and bug fixes for the operating system from Microsoft.
Security firms have said anyone using the software is at risk of infection and compromise by cyber thieves.
Statistics show nearly 25% of users have continued using Windows XP despite there being three major new Windows releases.
Dave Emm, a senior research analyst at security firm Kaspersky said: "Our data indicates that less than one fifth of our customers run Windows XP but more than a quarter of infections are Windows XP-based.
"Effectively, every vulnerability discovered after 8 April will become a zero-day vulnerability - that is, one for which there is not and never will be, a patch."
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