in win 7 you have to run the command from an elevated command prompt
How to : http://www.sevenforums.com/tutorials/783-elevated-command-prompt.html
Also you seem to have a lot of disks in trouble or alot of partitions on one drive. could you post a screen shot of Disk Managment.
type diskmgmt.msc in run box
explaination : paste from http://www.sevenforums.com/tutorials/507-built-administrator-account-enable-disable.html
Standard user (Users) - The standard account is an unelevated restricted users account. It can help protect your computer by preventing users from making changes that affect everyone who uses the computer, such as deleting files that are required for the computer to work. It is recommend to create a standard account for each user instead of an administrator account for the user. When you are logged on to Windows with a standard account, you can do almost anything that you can do with an administrator account, but if a standard user wanted to do something that requires elevated rights that affects other users of the computer, such as installing software or changing security settings, Windows will give the standard user a UAC prompt to enter the password of an administrator account for approval and confirmation before allowing the action.
administrator user - Is an unelevated administrator account that is created by default during the installation of Windows 7, or is already setup or you on a OEM (ex: Dell) computer. An administrator account has complete access to the computer, and can make any desired changes. To help make the computer more secure, this administrator account type will be prompted by UAC by default to give confirmation before allowed to make any changes that require elevated administrator rights. Such as those that affect the system, other users, or when running anything elevated (Run as Administrator) since running elevated will allow it to have access to the entire computer.
Built-in "Administrator" - Is the hidden elevated administrator account that has full unrestricted access rights and permission on the computer. By default, this elevated "Administrator" account is not prompted by UAC by default to provide confirmation before allowed to make any changes that require elevated administrator permissions since it is an elevated account.