To improve the reliability and robustness of commodity operating systems, it is very important to improve the reliability of the device drivers in operating systems. Currently, the research of improving the reliability of device drivers focuses on the efficient isolation of the device driver and the operating system kernel. We first design a new device driver framework VHarden based on the virtual machine technology, and then focus on a data transfer mechanism and the domain protection techniques. We implement the VHarden prototype using Xen and Linux. Finally, we use fault injection tools to test it. The results show that the VHarden framework is useful in improving the reliability of commodity operating systems.