Every 4 days, my laptop running Windows XP Pro has copies of the Outlook Express mail files in the recycle bin with file extensions .bak. I do not have a backup program set to do that. (I do use Acronis to perform weekly backups to an external drive). AVG anti-malware software is installed and up to date. Running latest AVG and Malwarebytes scans do not find any virus/trojan/etc. links or evidence. Any hints on how to proceed to see what makes these copies? I suspect a trojan that copies and then sends the files somewhere, but that is NOT an educated guess. Thanks.