...and they are generally used for security issues.. But if you'd like to try and reset it back to the old way, click on Start-Control Panel to open the Control Panel. Once the Control Panel is open, double click on the "User Accounts" icon, then select "Change the way users long on and off". When that opens, place a CHECK mark in the "Welcome Screen" option.. YOu may want to UNCHECK the "Fast User Switching" option unless you like to switch between users quickly. After making the changes be sure to "Apply" those options and restart the computer to see if the changes have taken effect.

In addition, you might want to check the Tax software's settings, there may be an option to reset from within the program.

Hope this helps.