Phishing email - how do i remove any possible malware or virus that may attack my computer?

Question

I recieved an email from which i now realise  was of the  phishing type. I claimed to be from USPS , told me the postal code was wrong , gave me a parcel number which i couldnt track and an attchament whiuch i unfortunately opened.The file within  was a B1 Free archiver and just contained a picture of a car.the mail aalsop claimed that it wouild charge so much per day after a 15 day period if I didnt receive the parcel.
i would be mlost grateful fro any assistance
thank you

Answer 1

when i opemn the original attachment( B1 Free Archiver) it says name- PA23892219.exe  ,  size -344 KB  folder -exe file .when i click on  the file I get all this except its much much longer as i cut it short
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