You are not the administrator and will never be. Administrator is an object.
You can temporarily give yourselves rights to perform some operations as if
you were Administrator, yes. Your power still will be limited. Actually you
do not need more than that.
in order to do what you want you will have to open Local users and groups
GUI (either typing lusrmgr.msc in Windows\system32\ -- do not forget to open
it as "run as Administrator" - take a notice!!!) or if you have Home or Home
Premium you should go thru Control panel> System and
maintenance>Administrative Tools>Computer management>Local Users and Groups.
Open up thumbnail Groups, open up group Administrators (nb: it is plural)
and you will see the object "administrator" in there. Add yourselves to this
group. Close the GUI.
You may have a somewhat easier life from now on but it may not be enough.
You may also establish yourselves as a person who has the right to write
into certain folders you want. Go to that folder, left
click>>Properties>>Security tab>>Edit>>Add>>type in your name>>Close that
window, Check checkbox "Full Control">>Apply>>OK.
Now you will have the right to do what you want in this folder and ALL its
subfolders. You will never be denied any access. You should exercise this
power judiciously and on a limited basis.