I have a user who is running WIN 7 IE 11. From time-to-time when they browse to a website that requires them to supply their domain credentials the dialogue box that generates contains credentials from a previous user and they must always select "Use another account". I've reviewed Windows Credentials Manager but that doesn't contain the account to remove. What we've noticed is that there's no Windows profile for the previous user. Its as if they remotely accessed the PC (possibly someone from the local Helpdesk), supplied their credentials, and now IE has them cached somewhere - I'm just not sure where.
My next step was to review the registry and see what pops up.