I bought a refurbished dell 6400 laptop. When I first set up the user account name, I put my own name in, which I then realized was the same name I set my desktop up with and since I planned on putting them on the same network, I thought it might be confusing. I went back into the laptop and changed the user account name to my wife's name. No problems.
When I start up the computer, it shows my wife's name as it should. However, I need to get into this