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My mum's bf's bank accounts got hacked today. Three different banks, all big banks in the UK, one of which uses a chip and pin security device to log in. He has a different password for all three banks (all complex passwords), only logs in from one computer, their wifi is password protected, he has AV and malware software running on the computer.

Thoughts? She called for advice on securing the puter / accounts but I don't know what else they can do really.