修改VISTA启动项grub4dos
光驱不好用了，只能硬盘安装linux，下面是vista下添加grub4dos启动项的命令：
bcdedit /create /d "grub" /application BOOTSECTOR
{40dbabf7-a088-11df-8d7a-d5a5b6540c2a}
bcdedit /set {40dbabf7-a088-11df-8d7a-d5a5b6540c2a} device partition=C:
bcdedit /set {40dbabf7-a088-11df-8d7a-d5a5b6540c2a} path \grub4dos\grldr.mbr
bcdedit /displayorder {40dbabf7-a088-11df-8d7a-d5a5b6540c2a} /addlast

可以通过bcdedit /?查看帮助,40dbabf7-a088-11df-8d7a-d5a5b6540c2a}是自动生成的。