Locked PC username & password fields greyed out

Thanks for your post
The power management option hibernation is off - as prior to updates
Where is the auto logon enable setting?
 I will check that

Standard auto logon method:
http://support.microsoft.com/kb/315231
Alternative, non domain computers:
http://www.microsoft.com/windowsxp/using/setup/tips/advanced/autologon.mspx

Have checked auto logon
We require users to enter logon password
Four days ago I built a PC with Win Xp
Locked it every night, no problem unlocking PC in the morning
Last night Hotfixes (KB887742 KB935843 )were installed
I could not unlock the PC this morning, I had to restart to logon

Have you tried un-installing the hotfixes as a test. I suspect KB887742 is more likely the problem. Though I haven't found the same problem, a search shows others have had logon related issues with that hotfix.

We are using Altiris PC management .
Last week I disabled Altiris sevices on a PC that every morning has greyed out logon.
With Altiris stopped the greyed logon has not occured
I will investigate further with Altiris

Interesting, wonder what, if any, tie between Altris and the Windows updates.

Altiris is used for patch mangaement
The locked pc issue occurs whether or not updates are sent out overnight

I was referring to the updates you mentioned earlier, KB887742 & KB935843, possibly conflicting with Altris, since you mentioned this is when the problem starting. However i didn't find any ties when Goggling.

I have uninstalled KB887742 & KB935843 Hotfix on 4 PC's, also removed them from Altiris Patch Management so theywill not be reinstalled.
So far no unlocking problem on these PC's, early days though
Awaiting further feedback over this week from the the users of these PC's
If feedback is positive, I will try this on more of the problem PC's

Let us know how you make out.
Thanks for the update.
--Rob

Removing the two hotfix did not work
On some PC the users could enter logon details but  the profile would not load, stuck on a blue screen.
The user then has to shut down by holding the power button in.
Other users report greyed out unlock window
Back to the drawing board!

Sorry, no other ideas at this time. I will stay "tunned in" and hopefully others will have some suggestions.
--Rob

We are seeing some of the same issues at my company, my network systems department are pointing to an application that I support (Tivoli/Passlogix desktop password reset application 'DPRA"). I am trying to rule out this app, and was interested to see if Barfoots also has this app deployed in his system.

Thanks for the assistance

Our company does not use DPRA
I suspect our problem occurs when Altiris does an audit of the PC when it is locked
The problem PCs have the firewall turned off (turned off to allow install of Altiris Client) and autoupdates configured for WSUS.
I have had some success by:
- Turnithe firewall back on
- Turn auto updates off
- Do not use screensaver
The remaining problem PCs do not have greyed out logon.
When logon is entered the pc goes to blue screen, restarting is the only option

Thank you for your reply, I am going to send this information to my Network systems Dept, and will also ask them to keep me updated on any progress on our side. If there is anything I can provide to help your situation, I will post. Just a note, we also use altiris, but I am not an admin for this system, so I do not know how we have it configured.