Hi. My name is***** you for your question and the opportunity to assist.
Start the machine up so that you are at the login page (but don't log in yet)
Once at the login page,
while holding down the Shift key click the Power icon in the far right bottom corner
and select Restart. Release the Shift key when you see "Please Wait"
When the Choose an Option page opens click Troubleshoot.
click Advanced Option
select System Restore.
You'll see a recommended restore date. Click Next and follow the prompts
System Restore will undo the updates and you should be able to log in normally.