i installed the new version of Ubuntu 10.04 then my grub header is 2.6.34.21 and i updated my system then grub displaying 2.6.34.21 and 2.6.34.24 my system is dual boot windows7. how i can delete the old 2.6.34.21 from my grub. i want to edit the grub as windows 7 is the first boot loader