[programing]

Hello everybody:


I have some problem with my computer: 1,my computer"s ACPI previous driven is ACPI uniprocessor pc.But after I Heavily installation computer's system,the ACPI driveing is change to Advanced configuration and power Interface . I can not start the computer while I change the ACPI's driveing to
the ACPI uniprocessor pc.
Why my computer's ACPI driveing is change to Advanced configuration and power Interface ? How can i to change to the previous ?

2, I Heavily installation OS's(windows xp profession) computer's startup's problem:After the computer finished the blue progress bar's Rotation I must waiting 30s before I enter desktop.
why my computer startup is so slowly ?
how can I improve it speed ?