So I managed to obtain a RC copy of the Windows 7 64 bits version, but when I'm ready to start the installation I got this message: "A required CD/DVD drive device driver is missing. If you have a driver floppy disk, cd dvd or usb flash drive please..." I have looked on google and the unique Workaround to this is setting on the BIOS the device from SATA to IDE, but that option doesn't come on my Dell Inspiron 6400 and I can't even boot from a external DVD drive (yeah my laptop s*cks). Other method is from the USB, but I don't have one of 4GB :-(. I was loking for a driver for this DVD Device (Optiarc AD5540A) but it appears that doesn't exist, just the generic ones that Microsoft have build in but I don't have it for Windows 7 or Vista, just for XP. Any ideas? thanks in advanced.