Applications in WinXP

I installed Windows XP and logged it in the domain. If the administrator will use the machine office application do work such as word, excel and etc. but my problem is when ordinary user will be using the PC such applications are not available for client use. If i try to install it under the clients rights it won’t go through and prompts me that i should have an Administrative rights to installed the software. Any help or knowledge regarding this will be big one.

thanks,
digital_cow