shut down without notice

[rajivfire]

see my comp shuts down whenever i am doing certain things on my comp
these include
1)playing arcanum.
2)installing xp.
3)installing acrobat reader
4)running virus scan
etc
these are few to name.
i hav formatted my hardisk,but the problem persists .sometimes i can work for hours on my comp whenever i am doing work which is less demanding on my comp.i don't get any kind of notice ,like saving your work ,etc.it shut downs suddenly .help me.
my system's configuration is
1.7ghz,p4,384mb ddr ram ,

[theraven]

more info needed
mobo , add on cards , smps rating .... software
tell us everything abt ur comp
it couldnt be a virus im pretty sure of it
maybe ur just overloadin ur smps
how long have u had this ? have u upgraded ?

[cooljeba]

may be a viri too rajivfire.
..:: peace ::..
Jeba

[it_waaznt_me]

Hmmm.. Have you overclocked your system ...?
Try monitoring the temperature of your system ...