I just got a new Lenovo Ideapad y580 running Windows 8. Today I took my first crack at dual booting Ubuntu on it. Since 32 bit is marked recommended, that is what I downloaded, but apparently it is not compatible with the UEFI windows 8 requires, so it never properly installed. I have read that I will need a Windows 8 recovery disk to rehabilitate my machine after uninstalling Ubuntu, but my machine did not come with one, and it would take a long time to get one shipped to me at the location I'm at. What is the best way to remove Ubuntu 32 bit and replace it with 64 bit while leaving Windows 8 intact?