I'm also confused why he don't use 0.5 ETH buy a hardware wallet to store his 45 ETH, you too brave store crypto assets on online wallet, computer include antivirus software doesn't mean anything, antivirus can't 100% protect your computer won't infected virus, unfortunately transactions on the ethereum blockchain cannot be reversed once sent, so don't expect you can get it back.
I agree, having such an amount on your account, the first thing you should take care of is security. Unfortunately, none of us can be 100% sure that their wallet is not secured, which means that all assets for storage must be moved to the most secure place.