Quite weird really. I had win xp pro installed and thought that on trying to install Vista it would give me the option to format the old operating system so as to have a clean install. The only options that appeared was the upgrade option that was greyed out and a straight Vista install. Vista actually kept the old operating system so that every time I boot it gives the option (1)Vista and (2) Old Windows. I can't be bothered to change things now as everything seems to be running fine: but for future refference does this always happen?