To fix the QuickBooks Error 1904 you have to perform below steps and for more query join QuickBooks Support USA.
First of all, you have to activate the built-in administrator.
Then, you need to press the windows key at once.
Now, write in CMD. And right click on the Command Prompt/CMD/cmb.exe & choose run as administrator.
After that, in the command prompt window, you need to type net user administrator/actives.
Now, you need to press the enter key.