On my Win7 Pro 64 bit I have somehow picked up a ghost account. The splash screen and the account manager show the same three accounts: Administrator, [me] & Guest. But the Task Manager and other tools shows that "mishmash" is the user and [me] never is. This causes some obvious issues in running applications. "Mishmash" was used once as a foldername for an eclectic collection of folders/files of another machine, temporarily housed on this machine while the other machine was upgraded from XP to Win7. This machine was also upgraded afterwards and "mishmash" may have been on one of its hard drives still. It is long gone in any event. How can an unregistered user exist? How to get rid of it? Is this a rather large security problem? All help appreciated.