I have a SW Media - Satellite C855D and needed to take it back to factory settings so I ordered the following "USB-Satellite C855D-Windows 8 64bit Professional-EN". I installed it as indicated by the supporting documentation that came with the USB drive. Once it was complete the laptop will not boot to windows. There is a note with the documentation that indicated if the laptop does not boot to windows to power the laptop down and restart it. I have done that 10 time now and it will still not boot to windows. I have reinstalled the USB flash drive 4 time now, still no windows.