Unable To Adjust My Power Settings

My Windows Vista isn't letting me adjust my power settings. Here is what the problem:

1. I click the battery icon in the bottom right of the start bar. Then I lick "More Power Options"

2. On the left panel of Power Options window, I click "Choose when to turn off the display" My computer tells me "Your power plan information isn't available" with a red X next to it. The same thing happens when I try to adjust any other power setting as well.

3. I click on the "Why can't Windows retrieve this information?" and it says stuff about my system administrator making changes, and that doesn't apply to me. I am the only user of the computer and my account is the administrator. I've never tinkered with any of these files to my memory................