My PC is constantly shutting down. For example, LSASS, RPC, RPCSS or DCOM is shutting down?
This is usually caused by your PC being infected with a worm that is shutting down essential operating system services which causes your system to shut down unexpectedly. You must install or enable a Firewall to prevent these types of attack. You can download patches for common worms such as Blaster worm, Nachi and Sasser worm.