Well I've been checking out some options in the Unattended page and found the "Computer Type" box. I'm using Intel P4 2.4GHz and the help button doesn't really reveal which option should I pick.

Any ideas?

Some P4 do have hyperthreading and some do not, I cannot tell you what setting would be right for you.

Anyway, letting it set on automatic is the best you can do, as it works that way on any computer.

Automatic is the best.

That setting is there mainly for those who want to disable ACPI by selecting the Standard PC, however this is not recommended with newer PCs.