I get error when install windows 7 ultimate x64 or x32 from second partition; I used digital river windows 7 , it's not from windows or from mass storage driver or chipset; I get error from 2 laptops dell inspiron n5110 with 2310m cpu and inspiron 6400 with t7200 cpu; I use the latest gru4dos and nothing http://code.google.c.../downloads/list I used 2 usb sticks silicon power 8 gb and transcend 4 gb with same error A required CD/DVD device driver is missing. If you have a driver floppy disk, CD, DVDm or USB flash drive, please insert it now. Note. If the windows installation media is in the drive, you can safely remove it for this step.