When you say it shuts down, do you mean it powers off or that Windows shuts down? If it powers off, a common cause is overheating due to build up on fans and more specifically the heat sink/fan assembly which cools the CPU. Have you kept up with cleaning these areas? If not, that's where I'd go first. I could think that abrupt shut downs while processes were running could cause the messages you are seeing. Windows likes to complete a shutdown process before power is removed and sudden shut downs can cause data corruption.
Hi I have an HP 754n that tends to randomly shut down. I've ran both AVG and Ad-Aware and have deleted any viruses present but my computer still randomly shuts down. Sometimes it cannot be restarted for a few min or a few days. Sometimes when it starts up I get a blue screen with the message "the type of file system is: NTFS one of your disks needs to b checked for consistency". when my computer does in fact start it may shut down immediately or after several min.
here are my system specs: 2.53 GHz Intel Pentiam 4 processor
512 MB DDR SDRAM memory
80GB hard drive