Step 1: Open Registry Editor. To do so, type Regedit in the Start menu search box or Run command box and then press Enter key. Click Yes button when you see the UAC (User Account Control) box.
(https://s33.postimg.cc/45mi8kdfv/Regedit.png) (https://postimg.cc/image/45mi8kdfv/)
Step 2: In the Registry Editor, navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
(https://s33.postimg.cc/h9s2lani3/Registry.png) (https://postimg.cc/image/h9s2lani3/)
Step 3: On the right-side, look for the entry named DefaultUserName, double-click on it and make sure that your Microsoft account or local user account name is appearing under Value data box.
(https://s33.postimg.cc/4v5akzykr/Edit_String.png) (https://postimg.cc/image/4v5akzykr/)
Step 4: Next, on the right-side again, look for the entry named DefaultPassword. If the entry doesn't exist, please create one by right-clicking on the empty space, clicking New and then clicking String Value. Rename it to DefaultPassword and enter your password in the Value data box. Click OK button.
(https://s33.postimg.cc/wihzz59hn/String_Value.png) (https://postimg.cc/image/wihzz59hn/)
(https://s33.postimg.cc/5xfh3mp4r/Stringedited.png) (https://postimg.cc/image/5xfh3mp4r/)
Step 5: Finally, you need to enable automatic logon. To do so, on the right-side (once again), look for the entry labelled AutoAdminLogon and then change its value from 0 (zero) to 1 (one).
(https://s33.postimg.cc/xxjko00bv/autoadmin.png) (https://postimg.cc/image/xxjko00bv/)
That's it! Restart your PC to see your Windows 10 automatically logging into your account without asking you to enter the password. Good luck!