A friend has tried to download and install AVC Anti-Virus+Firewall.
After shutting down Windows Firewall he completed the download when the
(WinXP Home) System announced a shut-down in 60 seconds because
instructed by "... NTAuthority\System."  A further error message
appeared saying Windows must now restart because Remote Procedure Call
(RPC) Service was terminated unexpectedly.  On rebooting manually the
Task Bar and Start button have disappeared. (No Taskbar settings have
been changed to cause this)  and the system shuts down again two
minutes later. Some Windows functions work - My Computer, My Documents,
etc and Control Panel can be reached via these. Where should I begin,
please?  All suggestions gratefully received.
Robert.