How to login to linux/windows without grub

grub> rootnoverify (hd0,0)

grub> chainloader +1

grub> boot

In case you want the grub screen from the grub command line

grub> configfile(hd0,7) /boot/grub/menu.lst

In case of grub 2.0 then
set root='(hd0, msdos1)'
chainloader +1
boot