This is a rare thing to happen but sometimes, due to OEM crap ware, the power plans in Windows 7 (or Vista, if that’s your thing ) either disappear or are renamed to something else than what they are in a clean Windows 7 install. Recently, due to a certain HP app, the High Performance power plan just disappeared from my Windows 7 Ultimate 64 bit edition install on my notebook and I was just left with 2 options for power plans, Balance and Power saver. Upon doing a little research, I found the fix for this.
All you need to do is go to the command prompt ( search for cmd in Start Menu ) and type in the following:
This will restore the default power plans as well as restore their settings to what they initially are so you might have to customize them again to your liking.