To disable the lock screen you need to make some changes in your registry
Note:
As always when editing your registry, there is a chance that your OS
can fail if the exact steps are not followed Before beginning, make
sure you create a full backup of your pc
Right click the Start button
Click Search
Type regedit and hit Enter on your keyboard
Double click HKEY_LOCAL_MACHINE
Double click SOFTWARE
Double click Policies
Double click Microsoft
Right click Windows
Click New
Click Key
Type Personalization and hit Enter on your keyboard
Right click the Personalization key you just created
Click New
Click DWORD (32 bit) Value
Type NoLockScreen and hit Enter on your keyboard
Double click the NoLockScreen DWORD you just created
Type 1 in the Value data field
Click OK
To re enable the lock screen, change the DWORD value back to 0