A method and system for protecting users from accidentally disclosing personal information in an insecure environment. In one embodiment, the method includes monitoring I/O device input data associated with a guest operating system on a virtualization platform. The guest operating system has less privilege than a privileged operating system on the virtualization platform. The method further includes determining whether the I/O device input data corresponds to personal information of a user, and delaying or blocking the transfer of the I/O device input data to the guest operating system if the I/O device input data corresponds to the personal information of the user.