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Hi there and welcome
Yes it is a scam alert, they fake this to try to get you to purchase their software and services, it does not mean your computer is infected though you should have anti virus software installed regardless, else you are at high risk. A proper virus will not let you know when it infects you, so this is why it is important to have anti virus software installed.
I can recommend a good free one (for private use, not companies) do you wish to have this?
Please let me know