ESET /NOD32 have released a small utility which you can use to check if you have the appropriate Microsoft updates that protect you from the NSA EternalBlue Windows vulnerability which includes WannaCryptor and any future copycat malware that uses this vulnerability.
You can download at the link below and just double click to run.
It only takes literally a second to do the check.
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Digitalwelcomemat provides IT consultancy and services for business customers on the NSW Central Coast in Australia.