When I lock a workstation (either via the screensaver or manually) I get
the following error when I try to unlock (PC reboots)

Event Type: Error
Event Source: Application Error
Event Category: (100)
Event ID: 1004
Date: 8/1/2005
Time: 3:21:39 PM
User: N/A
Computer: W20084769
Description:
Faulting application winlogon.exe, version 0.0.0.0, faulting module
LOGINW32.DLL, version 4.18.0.0, fault address 0x0002ab9e.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 41 70 70 6c 69 63 61 74 Applicat
0008: 69 6f 6e 20 46 61 69 6c ion Fail
0010: 75 72 65 20 20 77 69 6e ure win
0018: 6c 6f 67 6f 6e 2e 65 78 logon.ex
0020: 65 20 30 2e 30 2e 30 2e e 0.0.0.
0028: 30 20 69 6e 20 4c 4f 47 0 in LOG
0030: 49 4e 57 33 32 2e 44 4c INW32.DL
0038: 4c 20 34 2e 31 38 2e 30 L 4.18.0
0040: 2e 30 20 61 74 20 6f 66 .0 at of
0048: 66 73 65 74 20 30 30 30 fset 000
0050: 32 61 62 39 65 2ab9e

Any ideas?

TIA,
Mark