Some time ago I had Ubuntu Linux(alongside Windows 7) but now when I start my computer I have only option to press ESC and when red GRUB4DOS window appear. I really don't know how to use It. I have Windows 7 cd but I don't know how to boot It, because I can't change boot priority in BIOS(can't change anything either way). How can I boot my Windows 7 cd to install Windows and get rid of that red GRUB4DOS window? Thanks.