If you are logging in as Administrator, you can access anything you need to. To doubly check, you can run a script that will add a specific account to every machines local administrators group. If you logon as this user (administrator), you will get access to everything on the system, unless the specific user has gone into files and removed the normal permissions, however this could never affect any work you have to do really. Do you have an instance where you are having problems carrying out tasks locally with the Administrator account.
The fact that you have the ability to change the user passwords is a silly, and in most cases unecessary idea to do. As you have no way of retrieving their original password, you can not "reset" it to what it was previously. This means that the users will not know thier own password, unless you remember to tell them what you changed it to. Also, a password policy normally included a minimum history, so they cant use a password they have alreay used in X amount of changes, so they would have to get a NEW password. If you go around changing their passwords randomly this will annoy them even more, than standard password policies.
If you are having problems using the Administrator account, please specify your problems.
Hope this Helps.
Neil J Cotton
njc Information Systems
Systems Consultant