There must be an administrator, without it, windows will not function (properly that is). Go to Start-->control panel-->Users
Click on "User Accounts"
Locate your Name, and open the properties for your account.
Now, make your account administrator. It will probably ask for you to log in as administrator, so just log in as the administrators account (from what your saying, that would be as yourself)
Click "OK" and close everything. See if you are now the administrator.