Outlook Security Login keeps popping up formatted like "omain\"ser, why?

We have a user that gets a security prompt in Outlook 2013 that asks her log back into our exchange server. When it comes up the username is formatted really strange. Instead of Domain\User it replaces the first letter of each of those with a ". I have attached a screenshot. Why is this happening?
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Randy DownsOWNERCommented:
bad Windows Profile? Other users have that problem? Try creating a new profile on the PC.
Lionel MMSmall Business IT ConsultantCommented:
Look in the users "credentials manager" (Control Panel\All Control Panel Items\Credential Manager) and see find the problem there--if there is a user there that matches this then remove it. If there are no users there then try creating the credentials with the proper settings from there.

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stuart100Author Commented:
Thanks guys we will check these and get back to you.
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I've requested that this question be deleted for the following reason:

Not enough information to confirm an answer.
Lionel MMSmall Business IT ConsultantCommented:
The solution I gave works in most cases. using the credentials manager to store Outlook logon info fixing the problem most of the time.
stuart100Author Commented:
I will follow up with my support tech this morning and see what he did.  Standby

stuart100Author Commented:
My tech said that it was not in there incorrectly or at all. So he added it. The end user said she has not seen the prompt since. So that is a good thing.
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