Bizarre Domain Problem

I am having trouble with a user logging in to our domain. She is not able to
login from her Dell Optiplex 170L, but can login from any other computer on
the network. Every other user is able to login from her pc without any
problems. For some reason, only her specific login doesn't work on that
particular pc.

When she attempts to logon:
"The system could not log you on. Make sure your user name and domain are
correct, then type your password again. Letters in passwords must be typed
using the correct case."

*There are no errors reported on her system or on the domain controller.
*Deleting her profile makes no difference.
*Neither does deleting her Documents and Settings folders.
*Adding or removing her to or from any security group, including
Administrators is also ineffective
*If I reset her password she can log on, but only for about a day. After
that she only gets the error message mentioned above.

Does anyone know of a solution other than resetting her password on a daily
basis???
.

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