昨晚开机进入xp启动界面之后就蓝屏，报“UNMOUNTABLE-BOOT-VOLUME”，查了ms官网，http://support.microsoft.com/kb/555302/en-us，解决办法是：
插入xp安装盘，进入修复控制台，运行“chkdsk /r”修复完毕运行exit系统可自动重启。重启之后祸不单行，又报了个“lsass.exe 无法定位组件”，继续查ms，http://support.microsoft.com/kb/922371/zh-cn，整理一下解决办法：
1、插入xp安装盘，进入修复控制台;
2、expand F:/i386/ntdsapi.dl_ C:/;
3、copy c:/ntdsapi.dll c:/windows/system32;
4、exit;
搞定！
附ms解决方案原文：
RESOLUTION
To resolve this problem, follow these steps:1. Insert the Windows XP disk in the CD drive or DVD drive on the computer. Press and hold down the SHIFT key as you insert the disk to prevent the Windows XP installation from automatically starting.
2. Click Start, click Run, type the following command, and then click OK: expand CD drive:/i386/ntdsapi.dl_ %SystemRoot%/windows/system32/ntdsapi.dll
Notes• Make sure that there is a character space between "ntdsapi.dl_" and "%SystemRoot%." • CD drive represents the drive letter of the CD drive or DVD drive that contains the Windows XP disk. For example, if the letter of the CD drive or DVD drive is E, type the following, and then click OK: expand E:/i386/ntdsapi.dl_ %SystemRoot%/windows/system32/ntdsapi.dll
3. Click Start, click Run, type cmd, and then click OK.
4. At the command prompt, type the following command, and then press ENTER:
xcopy c:/windows/servicepackfiles/i386/ntdsapi.dll c:/windows/system32
不知道为什么，第二步的时候总是提示失败，把这个问题绕过去，先把“ntdsapi.dll”复制到C盘根目录，然后复制就ok了！正如我整理的第二步和第三步那样！
再重启，又冒了个“缺少samlib.dll”，与解决ndtsapi.dll方法一样，问题全部解决！
来源：CSDN
作者：iloveopera
链接：https://blog.csdn.net/iloveopera/article/details/2061028