XP keeps shutting down or restarting...

Hello Everyone...

I have a machine that keeps either restarting or shutting down w/o warning. It happens at various intervals. I cloeared out the event log so i could isolate what error message would be given. I got five error messages and this is what they say;

1. Source; Service Control Manager...
The DgiVecp service failed to start due to the following error. system cant fid the file specified.

2. Source: ACPI
AMLI: acpi bios is attempting to read from an illegal IO port address [0x71] which lies in the 0x70 - 0x71
protected address range.

3. Source: ACPI
AMLI: acpi bios is attempting to write to an illegal IO port address [0x70] which lies in the 0x70 - 0x71
protected address range.

4. Source: ACPI
AMLI: acpi bios is attempting to read from an an illegall IO port address [0xcfc]... lies in the 0xcf8 to 0xcff

5 Source: ACPI
AMLI: attempting to write to [oxcf8]... lies in the 0xcf8 to 0xcff range...

These are the errors, can anyone tell me what i have to do to resolve this issue???