Longtime User can't log into domain

In a 60 user domain running two domain controllers Windows 2008 R2 & 2003, one user has developed a problem logging in. She is on a Win 7 pro box. She has been using it for two years with no problems. Nothing has recently changed in the network.

On Friday, she reported not being able to login. She rebooted and nothing worked. Without restarting her PC, I logged onto her Pc as the domain administrator with no problem. I logged off and then she was able to login normally. She has the same problem again this morning.

Her AD account was not locked out Friday and it's not locked out this morning.
LVL 25
Tony GiangrecoAsked:
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Can you try resetting her password to something that uses characters on all standard keyboards and test? It still sounds like the user might be incorrectly entering the password. Given that it has worked every time you observed it...
What was the actual error message that didn't let her log on?

Can you check the security logs on both DCs and the client for anything around that time?
You could try dropping that machine from the domain and adding it back
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Tony GiangrecoAuthor Commented:
When she tries to login, she gets that standard message saying the user name or pw was incorrect with the red x. I just logged into her desktop with logmein, immediately entered her pw and logged in as her with no problem.

There was a message in the security event log that she was already logged in. When I logged into her pc remotely, it confirmed she was logged in. so i cliked CTL-ALT-DeL and logged her in with no problem.
SolpakTechnical DirectorCommented:
Sounds like an issue with the keyboard on her PC. As it works remotely from a logmein account then I would check:
1. Num Lock and Caps Lock settings on local keyboard
2. Replace keyboard encase some of the keys are not working correctly
3. Check user is typing the correct password
Tony GiangrecoAuthor Commented:
Nothing has been resolved. Here is what I've done so far.

1.      Verified her TCP & DNS info – it’s all static like it was before.
2.      Swapped in a new keyboard
3.      I ran a full Symantec Endpoint Protection version 12.1.1167 scan
4.      I ran a full Microsoft Malicious Software removal tool scan
5.      Took her PC to a workgroup and back into the domain
6.      Checked her password entry in Notepad to make sure it wasn't remapped.
7.      Verified her time and date is correct.
8.      Ran the set command on her Pc to verify she has a DC listed.

She isn’t having any other problems.  I’m running out of ideas. Later today I will move her to a new switch port and assign her a new IP address.
And are all other users from the domain OK on that workstation?
Tony GiangrecoAuthor Commented:
Yes, all other users in the domain are not experiencing this problem. She had no problem on Friday. I'm monitoring the situation again today.
Tony GiangrecoAuthor Commented:
it appears something changed on her AD account. I reset her password and it has been fine. i'm awarding points to each of you since you provided valid solutions that all helped eliminate possible issues.
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