Windows XP unresponsive unless I cntl-alt-del.

We have a customer with a HP Compaq 6710b notebook (on a docking station) running XP SP3.  Also running Symantec Endpoint Protection.  Client's machine is not on a domain.  Client has recently complained of the system locking up on startup.  He has waited for over an hour in some cases, then system will act normally.  We have determined that if the user does nothing more than hit the cntl-alt-del key combination the system will return to normal.  Do not even have to kill any process, just hit cntl-alt-del.  This occurs in safe mode as well.
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atiswConnect With a Mentor Author Commented:
We finally had the user try using his laptop while not connected to his docking station.  Suddenly his issue went away.  We determined that his Bluetooth mouse/keyboard combo was locking up his station until he hit the Cntl-Alt-Del sequence.  Thanks for all of your input.
I have had a lot of problems with the big commercial AV products lately.  It seems that they are more concerned in selling new licenses, so they keep adding "features".  Every feature they add seems to make computers run even slower.  You can try disabling Norton and/or switching to a free AV solution like Avast.  The free products can be pretty good, and they aren't concerned with adding features to sell more licenses.
Once the user is in go to start run and type "sfc /scannow"  without the quotes. If that does not work, try re-running  the SP3. I f all else fails you will need to do a repair install of XP on the system.
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The same behavious happen on my Dell Latitude D610.  the computer would stay "hung" at startup.

I hit the power button and it'd say something on the lines of "there are other users logged in. shutting down might make them lose data" ..  i say ok.. and it goes right thru ..

I observed that this happens. when i shut down my machine.. but close the lid before it is completely shut down.. if I wait for the shutdown process to complete before i close the lid.. it works normally...

atiswAuthor Commented:
I don't really want to switch AV on them as they are using it throughout their agency field offices.  This is the only user having issue and they all have the same hardware.  I saw one post that said to disable Sysplant for NT in the device manager, but same result.  Even in Safe Mode.

I tried a restore point to a few days before the behavior started and the results are the same.

I will give "sfc /scannow" a try and also re-install of SP3.
atiswAuthor Commented:
Tried both sfc /scannow and SP3 reinstall and still could not get this to work. Looks like a repair install of XP might be the only option.
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