China Girl W Xp

She has win xp
I have vista but this china chick I know
wants me to tell her why her computer shuts
down in 2 hours. She wants it to stay up.
Ha ya get it stay up.
I other words she wants her computer to stay
on at all times instead of shut down. She runs
her skype phone off this computer. I think it
must be a power setting but can't tell her how
to fix on her xp machine. Any help
may cause whitie to score.