I have an HP Elitebook 840G3. The hard drive was completely wiped. I have tried to install Windows 7 and I keep getting the error "Load Driver - a required CD/DVD drive device driver is missing. If you have a driver floppy disk, CD, USB, DVD or USB flash drive, please insert it now." This laptop doesn't even have a CD/DVD player in it, and I don't know what drivers it's looking for.