lockups on compaq presario 5006h
 

i have a compaq presairo 5006h i am having a problem with system lockups when
the computer sits idle or loading a program.have reformated the hard drive and
only thing on hd is xp...but still lockup have to reboot to get it unlocked any
help ?

the systen is running xp pro 384 meg memory 80 gig hd hard