Barefoot there are some very good programs for free available...Microsoft offers Microsoft Security Essentials...another is AVG Free...
Then you will need to get a Malware program and here again there are several free ones like Malwarebytes....and Iobit Advanced System Care...
With no protection you are a PRIME target for invasion. There are some virus that will be quite happy hiding in your PC and then hitch hicking on your emails to infect those you email to or you will eventually get something that will just shut you down.
You are vulnerable.
btk
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