Microsoft Account login is not opening

Hi Shivansh,

Welcome to Microsoft Community and thank you for your interest in Windows 10.

I understand the inconvenience that you are experiencing. I will definitely assist you.

There could be many reasons for this issue after upgrading to Windows 10. Please try the steps provided on the below link and check.

http://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/black-screen-after-upgrading-to-windows-10/bff96a52-f0da-4696-91c2-a7f305301d3d?tm=1438892592298

Hope this helps. Post us with status we will be glad to help you.

Hi, Angela.

Thank you for posting your response in Microsoft Community.

I understand your concern, and we in Community will try to help you in the best possible way we can.

I suggest that you perform the steps mentioned below and check if you can find any system file corruption.

Use System File Checker to repair damaged/corrupted Windows files 

Use the System File Checker tool to repair damaged Windows files. To do this, follow these steps:

1. Right click on the start menu and select command prompt (Admin).
2. Run the "sfc /scannow" command.
3. Try to install update again.

For more information about the System File Checker tool, view Use the System File Checker tool to repair missing or corrupted system files.

Your reply is very important for us to ensure a proper resolution. Please get back to us with the above information in order to assist you accordingly.

Hi Dan,

Run the Deployment Image Servicing and Management (DISM) tool and check. This tool will try to fix the corrupt operating system files. 

• Open an elevated command prompt. To do this, on the start screen type cmd, 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.
• Type the following commands. Press Enter after each command.

             DISM.exe /Online /Cleanup-image /Scanhealth

             DISM.exe /Online /Cleanup-image /Restorehealth

• Close the command prompt then check if it fixes the issue. 

Hi Dan,

There are spaces before /. I am highlighting with bold letters for your convenience.

DISM.exe /Online /Cleanup-image /Scanhealth

DISM.exe /Online /Cleanup-image /Restorehealth

Please check if it helps.  

 Ran both commands, no errors. Still cant log in.

Hi,

1. Are you able to login to the same account using web browser?
2. What is the exact error message?

I suggest you to reset the Microsoft account password once and check if it helps.

http://windows.microsoft.com/en-US/windows-live/account-reset-password-forgot-faq

Hope it helps.