ACPI error?Comp stops responding,please help!

[serendipiti]

my sys specs areIII 966Mhz,Intel 810e mobo with on board graphics,256MB SD RAM,40 GB HDD and am running win XP Pro SP 2.
I normally don't shut down my comp instead i use the hibernate option.quite often i see that on extended use my comp stops responding and i have to do a hard reboot(as even task manager doesn't work).Rebooting however solves the prob and on opening Event Viewer I see the following error:
Event Type: Error
Event Source: ACPI
Event Category: None
Event ID: 4
Date: 10-Dec-04
Time: 3:47:28 PM
User: N/A
Computer: HOME
Description:
AMLI: ACPI BIOS is attempting to read from an illegal IO port address (0x71), which lies in the 0x70 - 0x71 protected address range. This could lead to system instability. Please contact your system vendor for technical assistance.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 00 00 00 00 04 00 52 00 ......R.
0008: 00 00 00 00 04 00 05 c0 .......À
0010: 00 00 00 00 00 00 00 00 ........
0018: 00 00 00 00 00 00 00 00 ........
0020: 00 00 00 00 00 00 00 00 ........"

What is wrong with my comp?Please help somebody!

[klinux]

http://www.eventid.net/display.asp?e...e=ACPI&phase=1

if above doesnt help , try clearing cmos or enable acpi and change state from s1 to s3 or any other combo that works in the bios . check ur m/b manual on which bios setting to change for which state .