You should be able to do all of this while logged into your administrator account. When you open their C:\Users\(user-name)
folder the first time, you will have to grant yourself permission. Afterwards, you should have access all the time without being prompted. When you install a program from within your account, you would just need to make sure that they have a shortcut of it added in their Start Menu
if not already when installed.
Hope this helps,