While logged in to the problem user account on your computer, press the windows key-R to open the "run" dialog.
Enter the word CONTROL and then press the enter key on your keyboard. This opens the Control Panel.
In Control Panel click the Administrative Tools applet to open it.
Click Computer Management to open the Computer Management window.
In Computer Management on the left, expand Local Users & Groups and click on Users.
On the right, right-click the Administrator login and select Properties.
Remove the checkmark from "Account is Disable" and click OK.
Right click the Administrator login again and select Set Password. Then click Proceed if presented.
Set a password for the Administrator account. Then OK out of everything, close all windows and shutdown/restart the computer. Note that logging off will not accomplish what needs to be done here. You must restart the computer.
Upon successful restart, login as Administrator. Be patient. It takes awhile. YOu had to wait on all this crap before, remember? ":)
Now press the Windows Key+R again, enter CONTROL and press the enter key on your keyboard.
In Control Panel click the Administrative Tools applet to open it.
Now click Computer Management to open the Computer Management window
On the right, expand Local Users and Groups, then click on Users.
On the right, right click on your user login name and select the option to delete it, and actually delete it.
Now open File Explorer and navigate to the C:\users directory. If your login account name is still there, delete it. This step is important. Once you've confirmed your login account is not there and you have deleted it if it is there, you can close File Explorer.
Now back to the Computer Management window >> Local Users and Groups >> Users, right click on "users" and select New Users.
Enter your desired login name, and give it a password if desired.
Make "sure" you uncheck the box for "user must change password at next logon" then click OK.
Now right click your newly created user account name and select Properties.
Select the Member Of tab.
Click the ADD button.
Type in the word "Administrators" (without the quotation marks) then click the "check names" button. If there are no errors you did everything right so far.
Click OK and you should see "Administrators" in the "member of" window. Click OK to close this out now.
Now you need to shutdown/restart the computer again.
Once the computer restarts, you can log in with the newly created account. All of your libraries (documents folder, music folder, downloads folder, etc.) will of course, have nothing in them.
If you need to restore your .tax2017 and/or tax2018 files, you "may" need to let the TurboTax program create the documents/turbotax directory first, by starting the TurboTax program, starting a mock return, saving that mock return and then exit the program.
Then you can restore you tax files to the documents/turbotax directory and delete the mock tax file if you have to create one.
The windows account should be fine now.
On occasion (rare at that, but not that rare) you may find you will need to re-install the TurboTax 2018 program. If so, that's fine. Doing the uninstall first will "NOT" delete anything in the documents/turbotax directory.