1:在xp下运行bcdedit.exe(这软件在windows 7的系统盘下 就在你的c:\windows\system32\这里
2:将这软件复制到c盘根目录下
3:进入命令提示符 输入 c:
4:输入 bcdedit /store c:\boot\bcd /create /d "windows 7"
-application osloader
(复制 返回的{xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx})
5:输入 bcdedit /store c:\boot\bcd -set {xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} device partition=c:
6:输入 bcdedit /store c:\boot\bcd -set {xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} path \windows\system32\winload.exe
7:输入 bcdedit /store c:\boot\bcd -set {xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} osdevice partition=c:
8:输入 bcdedit /store c:\boot\bcd -set {xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} systemroot \windows
9:输入 bcdedit /store c:\boot\bcd -displayorder {xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} /addlast
原文：http://www.cnblogs.com/xieqianli/p/4224551.html