Access Denied?

Why is it whenever I download an object for The Sims 2 and unzip it on WinRAR, a message box comes up saying:
`__place object name here___
Access Denied.`

Am I doing something wrong?
Update: Please don`t spam and say stuff like `idk` or `what is the sims` or I`ll just report you as spam. =/
Update 2: I have Windows Vista, is that the reason why I cannot download these files?
3 answers 3