ok nvm, i know how to be an admin. http://www.maximumpcguides.com/logon-windows-vista-as-administrator/
nevertheless, i can't modify the files even as the admin. it seems that the admin has LESS rights than an administrative user. what the f. vista is so buggy.
still, i could be missing something.

alright i've been at this for an hour now, and i found a problem. you've been emphasizing how you must have administrator rights to give its users administrative rights. so how do you log in as an admin to give a user the rights?