Windows 7 won't boot

It would help diagnose the problem if you could see what is on the BSoD.  Fortunately here is a way to do that.

Windows is usually configured to automatically restart on a failure(crash/BSoD) so when you restart the system and before Windows starts to load begin tapping the F8 key to get to the Advanced Boot Options menu and from there choose:

Disable automatic restart on system failure:

If you miss the F8 windows of opportunely and don't see the Advanced Boot Options menu restart the system and try again - sometimes you have to get the F8 tapping timing just right in order to get to that menu.  Sometimes holding the F8 key down will work or you might also get a keyboard error (a stuck key) if you hold the key down.

Then when you see the BDoD use this example to tell us exactly what it says in these areas:

Then you need to supply some more information about your system and what resources you have on hand:

What is your system make and model or is it something assembled from separately purchased components?

If the system is a Dell what is the Service Tag Number?

If the system is an HP what is the serial number?

If the system is an Toshiba what is the serial number?

If the system is an Lenovo what is the serial number?

Describe your antivirus/antimalware environment.

Do you have any genuine Windows 7 SP1 installation media?

Does the system have a working CD/DVD drive?

This is for software corruption, seeing as you can't boot into Windows.

If this does not fix it, start looking for hardware problems.

Read the information at this link too:

What are the system recovery options in Windows 7?

Do a System Restore in Safe Mode.

"How to Do a System Restore in Windows 7":

http://www.sevenforums.com/tutorials/700-system-restore.html

"Advanced startup options (including safe mode)"

http://windows.microsoft.com/en-us/windows/advanced-startup-options-including-safe-mode#1TC=windows-7

"The Advanced Boot Options screen lets you start Windows in advanced troubleshooting modes. You can access the menu by turning on your computer and pressing the F8 key before Windows starts (Tap F8 at the rate of about once per second)"

@@@@@@@@@@@@@@@@@@@@@@

If that does not fix it, follow this method:

Often a Start-up Repair, etc. disk will work where the built-in Repair Software won't

Make your own System Repair Disk from the information in this Tutorial:

"How to Create a Windows 7 System Repair Disc"

http://www.sevenforums.com/tutorials/2083-system-repair-disc-create.html

"This will show you how to create a Windows 7 system repair disc to be able to use to boot to **system recovery options** to help recover your Windows 7 installation if you don't have a Windows installation disc, can't find your Windows installation disc, or can't access the recovery options provided by your computer manufacturer.

A system repair disc is not able to install Windows 7.

   Note

If you are unable to boot your Windows 7 to create a Windows 7 System Repair Disc, then you could create it on another computer to use on your computer."

_____________________________________

Then use that Disk for the System Recovery Options:

"System Recovery Options"

http://www.sevenforums.com/tutorials/668-system-recovery-options.html

"How to Run a Startup Repair in Windows 7"

http://www.sevenforums.com/tutorials/681-startup-repair.html

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

But if you do not have access to another Windows 7 machine with the same "bit" version use this method to make a disk, from which you can also use the Startup repair options:

You can use this for preinstalled OEM or Retail Licenses

Download the correct ISO file and make your own disk and use the Product Key that is on the COA Sticker.

https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-and-office-iso-download-tool

Download: Windows ISO Downloader.exe

Version: 6.00

Release Date: 11 April 2018

Requirements: Windows 7 or newer, .NET Framework 4.x, Internet Explorer 8 or newer.

Important: As of Version 6.00, we're adding back an experimental feature to generate links for Windows 7 and Office 2010. Generation of new links for these products is throttled, and not every download is always available in every language. New links are generated on a first come first served basis, with users who enable the idle resource donation getting preferential treatment. If you have further questions, please use theWinCert Forum to get in touch, so that other users can also benefit from the discussion.

And here are instructions on how to burn ISO images to disk:

http://www.snapfiles.com/get/ISORecorder.html

You change the Boot Order in the BIOS to be able to boot from your installation media:

How to Boot Your Computer From a Disc or USB Drive

You can use it for startup repair options or to do a clean install:

http://www.sevenforums.com/tutorials/1649-clean-install-windows-7-a.html

The COA sticker is either on the underside of the Laptop or in the Battery Compartment.

With a Desktop it is either on the side, rear or top of the Computer Case.

Using the downloaded ISO file Method may require phone Activation.

If it does require phone Activation, do not follow the Auto Prompts, but hold on for a real person to explain to as to what has been done for re-installation purposes

"How to Activate Windows 7 by Phone"

http://www.sevenforums.com/tutorials/18715-activate-windows-7-phone.html

The above method also will require you to go to your Computer Manufacturer's website > Support and Downloads Section > locate your Model Number and Operating System > then download and install the latest Drivers for it.

________________________________________________

Using the USB method in conjunction with the above Windows 7 download:

http://www.sevenforums.com/tutorials/2432-usb-windows-7-installation-key-drive-create.html

"How to Get and Use the Windows 7 USB/DVD Download Tool"

http://www.sevenforums.com/tutorials/31541-windows-7-usb-dvd-download-tool.html

________________________________________________

And this is very good and easy to use:

Rufus - Create bootable USB drives the easy way

Cheers.

Please answer as many of these questions as you can.  Maybe I can advise you.

1. Laptop or Desktop
2. Age of computer
3. make/model
4. Operating system installed (e.g. Windows 7)
5. 32 or 64 bit? (Right-click on Computer, choose Properties)
6. Service Pack 1 (SP1) installed? Same place as 5 above.
7. Capacity of disk drive, how much is in use?  Pie chart shown in Computer
8. Model number of hard drive (click Disk in Device Manager)
9. Age of hard drive if not the original
10. How much memory is installed? (Right-click on Computer, choose Properties)
11. Please list ALL installed programs.....
12. What security software is installed?