Blue screen of death

There are a few reboot options. The first reboot is to start a pc normally. The second is Safe mode. Another is Safe mode with Networking. and another is Safe mode with command prompt. Use Safe Mode to do minor adjustments or repairs, or virus scans while connected with the Internet with Networking option. DO not use Safe mode with command prompt unless you know what you are doing!

If you are not able to boot your computer in normal mode or supposed your notebook is infected with Trojans or malware, you are able to get rid of them with Safe Mode. Furthermore, it is easier and safer to bypass Windows 7 logon password in Safe Mode when lost or forgot Windows password.
For Windows 7, there are 3 different types of safe mode, Safe Mode, Safe Mode with Networking and Safe Mode with Command Prompt. The following guide is about how to bypass Windows login password with Safe Mode with Command Prompt. With command in safe mode, you can reset Windows password. Details are as follow:
Step 1: Start or restart your Windows 7 computer.
Step 2: Press F8 to enter Advanced Boot Options before the Windows 7 loading screen appears.
Step 3: Choose Safe Mode with Command Prompt in the coming screen, and then press Enter.
Step 4: Wait for Windows 7 files to load until Windows login screen comes up.
Step 5: Log in with an administrator account until you see login screen.
Step 6: A Command Prompt appears. Type net user in the Command Prompt and then hit Enter. All Windows user accounts will be listed for you.
Step 7: Type "net user iSunshare 12345" and hit Enter.
Step 8: The new password has been successfully reset when the command is completed successfully.
Step 9: Log on your PC with the new password.

Which operating system ????.....
Restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer
Windows Advanced Options Menu
Please select an option:
Safe Mode
Safe Mode with Networking
Safe Mode with Command Prompt
Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Debugging Mode
Start Windows Normally
Reboot
Return to OS Choices Menu
Use the up and down arrow keys to move the highlight to your choice
select safe mode with command prompt
Click start run type cmd press Enter
black screen should open DOS mode
this will vary depending on your operating system
type in net user username
For eg. If you want to change administrator password , type net user Administrator
It will prompt you to enter the new password.
Enter the new password and the password is changed
http://wiki.ljackson.us/Control_Userpasswords2
if this fails you will need to
Select safe mode with networking to download
you could download all of these or just one save them to a usb drive for later use if one fails to remove the password
Windows Password Recovery Basic
http://majorgeeks.com/CmosPwd_d239.html
A CMOS BIOS password recovery tool
Editors note: This tool should only be used by experienced computer users.

Restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer
Windows Advanced Options Menu
Please select an option:
Safe Mode
Safe Mode with Networking
Safe Mode with Command Prompt
Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Debugging Mode
Start Windows Normally
Reboot
Return to OS Choices Menu
Use the up and down arrow keys to move the highlight to your choice
select safe mode with command prompt
Click start run type cmd press Enter
black screen should open DOS mode
this will vary depending on your operating system
Click "Start" icon in the lower left corner of your computer screen
Type the word "run" in the window that appears.
A second pop-up window will appear; type in the letters "cmd," then select "OK."
This will bring up the black DOS command screen.
Type next to the administrator account the following command: net(space)user(space) the username(i.e. johnadams) *. After typing this command, hit "ENTER" on your keyboard.
Type in a new password in the command screen prompt that ask you to type a password. Type the new password again once you are asked to confirm.
Type the word "Exit." This will bring you back to your login screen.
Enter the new password that you selected.

try to start the computer just after starting it start tapping F8 key then you'll get a menu which says safe mode, safe mode with networking, safe mode with command prompt.choose last known good configuration that will take your computer to the settings which you used previously.

To start your computer normally you must choose either of that options but the only thing you must choose is the start windows normally so that all the settings from the previous working settings will be applied in your windows start up.

To use a Safe Boot option, follow these steps:

1. Restart your computer and start pressing the F8 key on your keyboard. On a computer that is configured for booting to multiple operating systems, you can press the F8 key when the Boot Menu appears.
2. Select an option when the Windows Advanced Options menu appears, and then press ENTER.
3. When the Boot menu appears again, and the words "Safe Mode" appear in blue at the bottom, select the installation that you want to start, and then press ENTER.

Description of Safe Boot options

• Safe Mode (SAFEBOOT_OPTION=Minimal): This option uses a minimal set of device drivers and services to start Windows.
• Safe Mode with Networking (SAFEBOOT_OPTION=Network): This option uses a minimal set of device drivers and services to start Windows together with the drivers that you must have to load networking.
• Safe Mode with Command Prompt (SAFEBOOT_OPTION=Minimal(AlternateShell)): This option is the same as Safe mode, except that Cmd.exe starts instead of Windows Explorer.
• Enable VGA Mode: This option starts Windows in 640 x 480 mode by using the current video driver (not Vga.sys). This mode is useful if the display is configured for a setting that the monitor cannot display.
  
  Note Safe mode and Safe mode with Networking load the Vga.sys driver instead.
• Last Known Good Configuration: This option starts Windows by using the previous good configuration.
• Directory Service Restore Mode: This mode is valid only for Windows-based domain controllers. This mode performs a directory service repair.
• Debugging Mode: This option turns on debug mode in Windows. Debugging information can be sent across a serial cable to another computer that is running a debugger. This mode is configured to use COM2.
• Enable Boot Logging: This option turns on logging when the computer is started with any of the Safe Boot options except Last Known Good Configuration. The Boot Logging text is recorded in the Ntbtlog.txt file in the %SystemRoot% folder.
• Starts Windows Normally: This option starts Windows in its normal mode.
• Reboot: This option restarts the computer.
• Return to OS Choices Menu: On a computer that is configured to starting to more than one operating system, this option returns to the Boot menu.

An environment variable is set when you use one of the Safe Boot options. The environment variable is SAFEBOOT_OPTION. This variable is set to either Network or to Minimal.

The default Microsoft VGA driver is used for display at 640 x 480 resolution and in 16 colors. You must log on in all modes by a domain or by the local Security Accounts Manager, depending on which Safe Boot mode you select.


Use the System File Checker tool (SFC.exe) to determine which file is causing the issue, and then replace the file. To do this, follow these steps:

1. Open an elevated command prompt. To do this, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
2. Type the following command, and then press ENTER: sfc /scannowThe sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.

To determine which files could not be repaired by the System File Checker tool, follow these steps:

1. Open an elevated command prompt.
2. Type the following command, and then press ENTER: findstr /C:"[SR] Cannot repair member file" %windir%\logs\cbs\cbs.log >sfcdetails.txtNote The Sfcdetails.txt file contains details from every time that the System File Checker tool has been run on the computer. The file includes information about files that were not repaired by the System File Checker tool. Verify the date and time entries to determine the problem files that were found the last time that you ran the System File Checker tool.
3. Type the following command, and then press ENTER: edit sfcdetails.txtThe Sfcdetails.txt file uses the following format: Date/Time SFC detail

This information was obtained from Support.microsoft.com

in windows 7 F8 is the key of enable safemode

Boot into the one that says, "Safe Mode with Command Prompt"

Once it's done it will ask for an admin password (sometimes) if it does just press the enter key, unless you set the Administrator password to something else.

Once your past that.

Type:

chkdsk /r

a message will pop up (sometimes) saying something about the disk being locked, blah, blah, blah.

Just press the Y key, then enter.

Restart the computer.

Let it do it's thing ( disk check will appear)

Let me know if this solves your problem.

try starting the computer normally, this usually happens if you computers power was cut while booting up, its just a small harmless glitch.  As for the returning back to the prompt try running it with command prompt. when you get to the command prompt, type (chkdsk) and let it run this might also fix any other problems that you are not seeing.