Hi,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
I am afraid that most of the troubleshooting steps to fix the boot issues need an admin password. Since you forgot it, however, disconnect all unnecessary devices that are attached to your computer and then try the following methods to fix the issue:
https://answers.microsoft.com/en-us/windows/for...
If the issue is still unfixed, performing a clean install is the last resort:
https://answers.microsoft.com/en-us/windows/for...
Be noted that you have to install the same Windows edition that was running on your computer in order not to face Windows activation issues.
If you have important data, try to rescue them:
https://answers.microsoft.com/en-us/windows/for...
Please let me know if you need further assistance and keep me updated.