Dell Inspiron 1525 with Vista

Question

Hi, I just purchased this computer and now I am experiencing the following problems:

1) Computer will not power off or go into sleep or hibernate mode. It always restarts.

2) "Tray" icons are showing that my internet connection is not connected (but it is) and that my antivirus software is not working and my Spyware icon is missing altogether.

As I said, I just got this thing - so please help keep me from throwing it against the wall! Thanks.