XP shutsdown immediately after startup

[Richard]

I hope someone can help with this...

- When I start Windows, the system starts to shutdown straight away
with the "NT authority\system - Remote Procedure Call Service was
terminated unexpectedly" countdown message. I can stop this with the
command prompt. (I had this problem with the Blaster virus, but that
was pre service pack 2, and on a different machine.) The same thing
happens when starting in safe mode.

- A full virus scan with an up-to-date Avast reveals no virus. The
Microsoft Malicious Software Removal Tool run from CD reveals nothing.
I've even run the Symantec Blaster and Sasser removal tools. No luck
there, either.

- I have no taskbar or start button.

- My internet dialup connection is missing, so can't connect.

- System Restore doesn't work. When trying to run it, I get the message
"System restore is not able to protect your computer...". And it
doesn't work in Safe Mode with command prompt.

- The system takes several minutes to start up - long stall on the
"Windows is starting up" screen.

I have Windows XP, Service Pack 2 - does anyone have any ideas! Many
many thanks,

Richard

 

[Richard]

If this is of any help, here are the system error records from startup
to the point at which the automatic shutdown initates...

27/01/2006 20:59:15 USER32 Information None 1074 NT
AUTHORITY\SYSTEM ACER The process winlogon.exe has initiated the
restart of ACER for the following reason: No title for this reason
could be found
Minor Reason: 0xff
Shutdown Type: reboot
Comment: Windows must now restart because the Remote Procedure Call
(RPC) service terminated unexpectedly

27/01/2006 20:57:24 W32Time Error None 46 N/A ACER The time service
encountered an error and was forced to shut down. The error was:
0x800706D3

27/01/2006 20:57:23 Dhcp Warning None 1004 N/A ACER The DHCP Client
service is shutting down. The following error occurred :
The authentication service is unknown.