[Hellfighter]

start> run

type in

chkdsk /f (f=full quick scan)

chkdsk /F /R (F=Full / R=deep through scan take way longer to look for errors)

type Y=yes

restart your system as it boot up it will scan for errors on the HD drives

*cutting the power off can make more error special if it writing to the HD as you kill it. i would try to see if you can get a reset button install on the PC tower to reset the system (MOB) without having to cut the power off.

in the last 90days have you add any new hardway to you PC? some times a new item can go back and make the system lockup, check for any new update software/ drivers for your new hardware like Video cards, sound card, video capture cards...ect

Ps my use to lockup a bet too for no reason at all, i install a reset button on my tower to the MOB when it happen i press the button and system restarts and helps when it happens, without making it crash by cutting the power off.

btw:
Intel core2quad Q9400 @ 2.66ghz stock speed
Ocz dual channel kit 4gb Ram @ 1066
Evga 750i Motherboard
xfx nvidia 9800GTX+
rosewill PSU 550W
WD 320GB

Operation system? (OS) windows XP family? Vista family? 2000? or a server 2008.........ect
oh os is vista home premium 32bit ok

don't know if windows vista use the chkdsk option for it to use could try see if it comes up