This error can occur for several different reasons and can sometimes be after a windows update.
- BIOS is not ACPI compatable
- Memory configuration. This error can occur because of the memory arrangement you have. Usually if you go above 2GB.
- Faulty RAM
Try these solutions in order.
- Try a different RAM configuration - If this turns out to be the solution more than likely there is windows updates waiting that will fix this issue so run all updates and you should be able to use the extended memroy configuration.
- Check RAM
- Update BIOS to an ACPI compatable version
In all case run windows update and download all updates.