luigi2169 there is almost no chance to get back your coins-but maybe you can help others with some additional information,do you use any security software on your PC/do you download some program/file from internet in the last few days?
Hi Lucius, I use Malwarebytes premium edition and in my last scan shortly after discovering that the coins had gone missing it showed that there was no threat/virus/malware? Like I mentioned, I kept my wallet on a pen drive/usb. I am at a loss as to what happened?
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Do you have antivirus and firewall on your PC or just MB Premium?is it possible that someone else has access to your pen drive/usb, maybe some friend or family member?It is also possible that you exposed some of your private keys or seed,only one private key can be used to generate seed for wallet.
Unfortunately as I said chance to get back your
BTC is almost 0.You should format your hard disk/install fresh copy of windows and if you plan to use
BTC in future get hardware wallet like Trezor or Ledger.