完全安装后的引导怎么改？

我已经完全安装到ext3分区了，能够保存能够自动引导，而且将启动时硬件探测关闭了，这样速度快了很多。但是开机后要回车两次才能进去，我不知道怎么设置这几个引导文件，我现开机直接进入系统，不用选择，不用回车。现在的grbu文件夹里面多了很多文件，不知道怎么弄，望解答
开机要选择一下后回车，闪过一下后又问我要回车，好像还没有时间限制
menu.lst文件
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# GRUB configuration file '/boot/grub/menu.lst'.
# generated by 'grubconfig'.  2008年09月05日 星期五 22时55分15秒
#
# The backup copy of the MBR for drive '/dev/hda' is
# here '/boot/grub/mbr.hda.9919'.  You can restore it like this.
# dd if=/boot/grub/mbr.hda.9919 of=/dev/hda bs=512 count=1
#
# Start GRUB global section
#timeout 5
color light-gray/blue black/light-gray
# End GRUB global section
# Other bootable partition config begins
  title Windows (on /dev/hda1)
  rootnoverify (hd0,0)
  makeactive
  chainloader +1
# Other bootable partition config ends
# Other bootable partition config begins
  title Windows (on /dev/hda2)
  map (hd0,0) (hd0,1)
  map (hd0,1) (hd0,0)
  rootnoverify (hd0,1)
  makeactive
  chainloader +1
# Other bootable partition config ends
# Linux bootable partition config begins
  title Linux (on /dev/hda3)
  root (hd0,2)
  kernel /boot/vmlinuz root=/dev/hda3 ro vga=790
# Linux bootable partition config ends
title Install GRUB to floppy disk (on /dev/fd0)
pause Insert a formatted floppy disk and press enter.
root (hd0,2)
setup (fd0)
pause Press enter to continue.
title Install GRUB to Linux partition (on /dev/hda3)
root (hd0,2)
setup (hd0,2)
pause Press enter to continue.
title -     For help press 'c', then type: 'help'
root (hd0)
title -     For usage examples, type: 'cat /boot/grub/usage.txt'
root (hd0)

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