Quite a large portion of the machines hit by the WannaCry Ransomware virus were running Windows 7.
The Ransomware started spreading mid way through May, so far, it has only infected around 200,000 computers from different areas around the world.
In the UK, quite a few branches of the NHS have had to turn away their patients due to the worm shutting down all their computer systems, leaving Doctors and reception staff without patient info such as conditions or medication.
A lot of people have suggested that the main reason that the NHS suffered was because of their programs still relying on Windows XP, a version of the famous Microsoft OS Windows that was debuted in 2001 and support ended in April 2014.
Windows 7 was first released in 2009 and the most widely infected version of the virus was the x64 edition.
After the encryption of the files, the Ransomware demanded a payment of £230 in bitcoins (highly untraceable currency,) before they were given back with the encryption removed.
There have been no reports that anyone who paid has had their data restored by the gang behind the attack.
Security experts also found that the worm spread largely by seeking out vulnerable machines on the net by itself. When it had first got started, people believed it was due to an email-based phishing campaign.
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