Question : Problem: ACPI BIOS is attempting to read from an illegal IO port address

This is a used computer and just installed XP pro with all updates and drivers.
This is the only problem in event viewer and it causes a lock-up anytime the screen saver comes on.

Here it is and thanks again!

Event Type:      Error
Event Source:      ACPI
Event Category:      None
Event ID:      4
Date:            3/30/2007
Time:            4:15:54 PM
User:            N/A
Computer:      ASUS
Description:
AMLI: ACPI BIOS is attempting to read from an illegal IO port address (0xcfc), which lies in the 0xcf8 - 0xcff 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   ........


Event Type:      Error
Event Source:      ACPI
Event Category:      None
Event ID:      5
Date:            3/30/2007
Time:            4:15:54 PM
User:            N/A
Computer:      ASUS
Description:
AMLI: ACPI BIOS is attempting to write to an illegal IO port address (0xcf8), which lies in the 0xcf8 - 0xcff 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 05 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   ........


Award Medallion BIOS v6.0
BIOS Properties      
BIOS Type      Award Medallion
Award BIOS Type      Award Modular BIOS v6.0
Award BIOS Message      ASUS A7V ACPI BIOS Revision 1004D
System BIOS Date      09/26/00
Video BIOS Date      99/08/30
      
BIOS Manufacturer      
Company Name      Phoenix Technologies Ltd.

AMD Athlon 1.0GHz
512 RAM
Win XP Pro
ASUS A7V VIA KT133 mobo
AVG anti-virus

Answer : Problem: ACPI BIOS is attempting to read from an illegal IO port address

Silly question, but have you double checkedthere are no more recent Video Adapter drivers out there?