If you no longer log on automatically to your computer, you PC require to press CTRL + ALT + DEL and to enter a password or you computer has more than one account and you want to login in Windows with a default account automatically without asking anything else you need to do some basic steps .
Step 1 :
WinKey+R > a black command prompt window will open > type control userpasswords2
Start > Search > netplwiz
Step 2 :
A window with users will pop up .
Uncheck the box with Users must enter a user name and password to use this computer, select desired User that will be automatically logged in, click Apply button.
In the next dialog box, enter and confirm the password for the selected User, leave it blank if you don’t want to ask for a password at log in, and then click OK button.
Click Ok on the User Accounts window .
I hope this will help you .
Good luck !