Windows 10: Unable to log into Windows 10 Pro 64bit desktop

Hi, Many thanks for allowing me to use this forum for help.
My Windows 10 Pro 64bit desktop with 8GB memory, 2T HDD, has been running well since I got it in July 2019. However, yesterday I tried to log into Windows as usual with my 4 digit pin and it came up "wrong credentials". I don't have the wrong credentials. The pin, as well as being wrote down in my password book, it is well embedded into my mind and I know it is the correct pin. The usual page comes up with my icon, my registered email address below it, and the field to enter my pin, but it simply won't let me in. As well as being the owner, I am the administrator. A few days ago I installed a paid version of Advanced SystemCare 13 PRO. I'm wondering if it has changed something affecting my login, but I have no idea. Please can anyone help / advise how (if possible) to get logged in / bypass the sign-in screen. The F12 (for Dell system) no longer shows up during boot-up. I'm currently using my laptop to get help. I'm unsure of which updated version of Windows 10 I'm using on the desktop, but it is up-to-date. Many thanks.

:)

 

kill dwm.exe windows 10 pro 64bit

I found this link

What is dwm.exe and why is it using so much memory?

With this note: "The steps below only work for Windows Vista and Windows 7. Desktop Windows Manager is not displayed in the Services window on Windows 8 and Windows 10, and therefore cannot be turned off or disabled."

These links have suggestions for improving performance:

dwm.exe Desktop Window Manager High CPU on Windows 10 [Solved] - Driver Easy
Fix: Dwm.exe issues in Windows 10
I would start here:

 

upgrade windows10 to windows 10 pro on a Dell 64bit desktop. Have

upgrade windows10 to windows 10 pro on a Dell 64bit desktop. Have a product code for 10Pro.

 

Unable to install printer drivers on Windows10 64bit Pro

Hi Grey,

It is possible that you're unable to install printer drivers due to compatibility issue or corrupted drivers. To provide you the accurate resolution, we'd like to gather more information:

• What is the make and model of your computer?
• Since you've mentioned that you've followed a dozen suggestions, what are those troubleshooting steps you've done so far?

In the meantime, we suggest that you follow the steps in this article on how to troubleshoot printer problems
in Windows 10. You can expand each section and perform the instructions which you're not yet done.

Additionally, you may also check the information shared by Andre Da Costa on this
thread about how to determine if you're computer is compatible
with Windows 10.

Keep us posted if you need additional help.