My Laptop (Lenovo Ideapad S12) Will Not Fully Turn Off?

Recently my laptop got a virus that latched itself onto a very important program that was required to start my computer, so my virus detection deleted the file and the virus along with it. Needless to say my laptop needed some fixing and luckily I knew some very computer savy friends. They wiped the hard drive and reinstalled windows xp for me (it was originally xp pro, but now I have home edition) I got all of the drivers reinstalled by them (I think). However, ever since it was fixed, it rarely shuts down fully. It will log out of the user and will be stuck on "Windows is shutting down" until it loses power. I have cold booted it twice and do not want to do it again in case it damages it. It also stays stuck on stand by mode and does not recover when it is shut and reopened. It also will go to a black screen after 1 minute of sitting idle (but it does recover from that with movement of the mouse or typing a key). All drivers appear to be installed. This has not happened before my laptop was reconfigured. I am also giving my computer friends a bit of a break as I have been asking them for a lot, which I am very appreciative of, so I am trying to solve this issue by myself for the time being. ANY information that may help or give any clues is welcomed.