Winlogon.exe encountered a problem

Using XP Pro with SP3 installed.
3 users on home computer.
When the logon screen is left ofr some time the screen blacks out and I have
to reboot using main switch.
I get a message saying Winlogon has encountered a problem and a box saying
click cancel to debug.
The debug does not cure the problem.
Also all my restore points have disappeared.
Can anyone help?
Thanks

On Sun, 22 Jun 2008 11:04:30 +0100, "Rocky" <I ate Spam@ntlworld.com>
wrote:

>Using XP Pro with SP3 installed.
>3 users on home computer.
>When the logon screen is left ofr some time the screen blacks out and I have
>to reboot using main switch.
>I get a message saying Winlogon has encountered a problem and a box saying
>click cancel to debug.
>The debug does not cure the problem.
>Also all my restore points have disappeared.
>Can anyone help?
>Thanks
>
>

I use Tweakui to take me past the logon screen automatically .