Sorry to hear.

If your crypto is stolen you cant get it back, unless you locate the hacker and persuade him to return it. Thats why it is so important to control and protect your private keys.

In the future it is better to use Linux or Mac instead of Windows (less chance of viruses). If you really want to use Windows, get a new harddrive and reinstall fresh. Store your passwords in encrypted text files or better memorize them. Dont use autofill feature of your browser or store passwords in unencrypted text files/documents. Research software before you install it and use a trusted antivirus software (not needed for Linux but necessary for Windows).

Ledger should have been safe but it sounds like you had a remote access virus. If you continue to use Windows for daily tasks, make a read-only Linux USB to send crypto with your Ledger. This will give you a safe environment to make and broadcast transactions. You could also keep your private keys completely offline and only connect to internet to broadcast signed transactions but 1) ledger should be enough 2) if you already have a virus, even this doesnt help.

Possibly you could report the paypal and bank transfers as unauthorized but I am not a lawyer.

Edit: Read that there could be compromised fake/used Ledgers. In this case, get a new Ledger direct from the company website (https://www.ledger.com/products/ledger-nano-s).