Computer shuts down

Since my computer updated Windows a few days ago, my computer shuts down right after I press enter to accept the password. I cannot get into my computer, past the welcome screen.

Hello Bethel,

This shouldn't have happened due to AVG.
Could you contact Microsoft support regarding this as it had happened after a Windows update?
Thanks.

Hello Si,

We're sorry to know that you have uninstalled AVG.
Could you explain what exactly happened after using AVG?

I've uninstalled all AVG products - absolute nightmare as I trusted it so much.

I've uninstalled all AVG products - absolute nightmare as I trusted it so much.