Event Viewer Log: iaStor Error-Event ID 9 error

I am to see the above mentioned[iaStor error- Event ID 9 error] on my Event Viewer and it is always happening at the time of the start of my computer.

I have updated the latest BIOS,Chipset & Intel Matrix Storage Manager drivers.

 

Is there any explanation?

 

snow

Dimension 9200
Intel ViiV Core 2Duo E6400 Processor 2.13GHz 1066 MHz 2MB
Windows XP media Centre Edition 2005 now VISTA OS 32bit
Memory:2048 MB Dual DDR2 533 MHz [2x1024]
Dell Wireless Bluetooth Keyboard & Mouse Dell Wireless Bluetooth
Video Card: 1GB nVidia GeForce 7950 GX2 Dual graphics card
Sound Card Sound Blaster X-Fi Xtreme music
Intel 82801 HR/HH/HO SATA RAID controller
Intel Matrix Storage Manager v7.5.0.1017
Chipset v.8.1.1.1013
HL-DT-ST DVD +/- RW GSA-H31N
HL-DT-ST DVD-ROM GDRH10N
Hard Drive: 640 GB [2*320GB]SATA stripe RAID 0
Media Card Reader 13-in- 1 internal