I. Description
On the computer, before the university is poorly understood. A few examples, just go to college first, when I still can not tell which is the computer host and display; the second is to be a freshman last semester to accompany snapped Friends Electric Division Z to buy a computer, I asked Purchasing Guide what XP and Win7 ---- I always suspected relationship to ask this question is that the mentally handicapped Purchasing Guide dare to sell more than two hundred of the memory of one of our more than six hundred reasons; the third is probably sophomore next semester when a classmate and roommate in W engage in a project, they installed a Ubuntu operating system say this is Linux, I was determined Linux is a graphical interface in the dormitory.
The first look at someone else installed operating system, or in the Electric Division, is a sophomore next semester like their computer can not open the electrical department to repair ---- My computer is bought and roommates L acquaintance of his in the Electric Division the ---- forgot to say what the problem is he gave to reinstall the operating system to close 50 dollars, I asked if he could say his own equipment possible to copy the ISO file that the next two Win7 then go back to their own old peaches make a boot disk on it. The operating system is first installed after over time roommate Z took the laptop to run slowly came back and said something to reinstall the system, not the machine after repair computer back no chance to practice but can determine their own heavy equipment, and in addition to a roommate Z by operating the online tutorial step by step, really installed a success. The first time I heard when broken system password should still be sophomore next semester and then later, when it should be in the library to study up on selected electronic professional roommates Z selected on the QQ ask for information security that they have forgotten sister of computer login password will not break, I said no, back to the dorm after he asked him how to say broken, and asked him how his operation of said U disk into the PE software can have a break, now he may have I do not remember a thing but I have always taught me in with him this mode of "removed from the lakes."
Second, remember the BIOS password forgot password operating system, in order to remove the operating system BIOS password
This is the scene on a scene roommate mentioned Z facing is usually the most frequently encountered, the solution also as previously said:
The first step in using the old peaches , etc. to make a boot disk. Download, extract, and hit start, choose U disk, you can make a key, do not say.
The second step, into the PE boot disk from the U. However, different computer brands (more accurately should be the motherboard) to enter the BIOS / boot media selected shortcut key is not the same, there is no good way to Baidu to fend for themselves or one by one test, Esc to F12 are likely to Del is also possible .
The third step, open the "Password to modify" tool, select the user, change the password.
Third, forget the BIOS password remember operating system password, in order to remove the system BIOS password
It should be concerned, because it is in fact rarely used BIOS password is easy to forget more than the system password, but a BIOS password is not enabled by default, two start the operating system does not need to enter the BIOS password, three ordinary users are generally did not enter the BIOS needs, so often we do not need to remember or forget it forget that we do not need the tube.
But inevitably some "power users" have forgotten want to clear the BIOS password BIOS password to enter the BIOS needs, here we are speaking about how to deal with this situation.
3.1 motherboard BIOS default password
This is the online information that I have not seen is that some motherboards have BIOS default password, you can try to find it online or have to ask customer service.
First, the type of motherboard but a lot of it can be found online correspondence will not be great feeling of hope, the second is to steal Lai and customer service to avoid entering the BIOS come up with other issues so even know that the great probability will not tell you the third is that the default password essentially the equivalent of a back door does not comply with safety regulations in the safety of increasingly demanding specifications of the moment can be expected this practice should be less and less.
Can be considered an idea, take a chance of it, you can only say so.
3.2 Use DOSBox + debug clearing the BIOS passwords
Originally enable debug mode directly in cmd can, but Win7 64-bit operating system and later are removed debug.exe, so we need our own installation environment.
DOSBox Download: https://www.dosbox.com/download.php?main=1
debug.exe Download (Internet just to find): http://soft.onlinedown.net/soft/578004.htm
Installed DOSBox, then debug.exe casually put in a directory (best not Chinese, I am here to put the root directory of C), proceed as follows:
::前面的SET BLASTER=A220 I7 D1 H5 T6是DOSBox自己执行的，不用管 ::把本地c:盘挂载到DOSBox的c目录；如果debug.exe放在其他盘类似挂载即可 mount c c:\ ::进入c目录，这里亦即c盘 c: ::进入debug模式 ::前面的-是debug模式自带的不用输 ::开头的o是字母o，后边的70是数字0 debug o 70 16 o 71 16 q
这种办法，我测试时开始几次似乎是成功的，执行后BIOS密码为空，但执行几次后似乎就没用了，不太确定。
网上还有其他用cmospwd等输件进行破解的介绍，但我在自己的Win 10上没能成功所以现在效果怎样不确定。
四、同时忘记BIOS和操作系统密码
应该来讲，BIOS密码启用、忘记BIOS密码、忘记操作系统密码这些情况同时出现的概率还是比较小的，但也不是不可能。
最常见的就是公司给配的电脑，这种电脑经常启用的BIOS密码、你也不知道BIOS密码，在公司使用的是域账户你平时也不会输本地用户的密码，用了几年电脑归你后你一重启这些情况就会同时出现了。当然还有另外一种不太想说的可能，那就是电脑根本就不是你的你想进行破解。
此时我们不能借助一方消除另外一方，只能借助外力外物先强行突破其中一方。
4.1 以BIOS密码为突破点
4.1.1 尝试使用快捷键直接从U盘启动
一般顺序来讲，都是要求选输入BIOS密码然后才能选择从哪里启动的，网上说有些电脑在BIOS可设置不需要使用BIOS密码即可通过某些快捷键列出启动项，然后可直接选择从U盘启动。
我没试过，不太了解具体是什么情况；而且，“有些”而已。
4.1.2 卸载CMOS电池
BIOS是安装在CMOS之上的系统，使用的是RAM，断电之后所有非默认配置即会丢失。所以我们只要把CMOS电池卸载掉，设置的BIOS密码也就被去除。
虽然我觉得现的在硬件应该是没有那么脆弱，但一是网上有说静电可能损坏硬件，二是我没实际操作过，三是我对主板硬件行情不是很了解，所以还是建议不到最后不用这招吧。
4.2 以操作系统密码为突破点
4.2.1 只是忘记密码，操作系统还可以正常使用
这种情况可以把电脑的硬盘拆下来，然后使用移动硬盘盒接到另外一台电脑上，然后类似第二大节那样把操作系统破掉再把硬盘装回去即可。
这个操作最为关键的点是如何确定硬盘C盘在另外的那台电脑上是什么盘，因为接上另一台电脑后硬盘的C盘在接上的电脑上可能变成了G盘H盘等等。确定的方法一可以根据硬盘大小，二可直接打开各盘查看盘下文件是不是系统盘文件。
4.2.2 不仅忘记密码，操作系统已不可启动
此时先和4.2一样把硬盘接到另一台电脑上，然后可以在另一台脑上使用ghost等工具把GHO文件刷到硬盘上；也可以从U盘启动进入PE，PE一般都带ghost工具。
GHO文件可以使用ghost等工具备份新电脑的C盘得到（但这样会有很多不必要的文件）；也可以直接从iso文件中提取，装虚拟机时也可以明显看到使用的也是ISO中的GHO文件。
Local----Partion----From Image，先选中GHO文件，然后再选要覆盖的盘符即可。确定哪个盘同样使用大小和盘内文件进行判断即可。
Image file name to restore from----选择GHO文件。
Select source partition from image file----选择镜像文件中的分区。一般GHO文件只有一个盘即C盘。
Select local destination driver by clicking on the driver number----选择本地要覆盖的磁盘。
刷完后把硬盘安装回，然后启动，预期即会进入安装驱动那四步的那个界面，像正常装系统那样等待完成和自动重启即可。
但一是我没实操作，二是MBR我没有很了解所以我不能确定命中系统这方面会不会有问题。
参考：
https://jingyan.baidu.com/article/14bd256e469974bb6d2612a8.html