Sounds like a permissions issue with the root folder of your hard drive. Any number of things could have caused this but here is a tutorial which should fix your problem...
Take Ownership Shortcut
"Taking ownership" will override the evident lack of permissions. Follow the tutorial carefully.
Also, please do not post your personal email on any thread in SF forums since it is against SF forums rules: http://www.sevenforums.com/general-d...ease-read.html