It’s highly likely that all Sony smartphone or tablet users here on XDA have heard of Flashtool by XDA Recognized Developer Androxyde. It’s a great tool, which allows you to restore your Xperia to stock state, root it, unlock the bootloader, flash a kernel, and do basically everything else that’s needed to enjoy the custom ROM world.
Flashtool works on three platforms, including Windows which needs external drivers to successfully access the flash mode. These drivers were incorporated Flashtool, but eventually became outdated and out of sync with the new Flashtool releases. Androxyde therefore decided to release the driver pack separately. With help of XDA Recognized Developer DooMLoRD, the Flashtool team provides a new version of drivers that should help you to use Flashtool to backup or restore your Sony Xperia device. There are some issues with Windows 8 (surprise, surprise), but they have been resolved and the information to do so is in the thread’s OP.
These versatile drivers can be found in the original thread, which is housed in the forum. If you own a Sony device, don’t hesitate to go there and grab a copy. Don’t forget to get a newest version of Flashtool while you’re at it, which can be found in its thread.