SIW

SIW or System Information for Windows is an app that will tell you just about anything you may need to know about your system.  From hardware to software it knows it all. It will inform you of how many sticks of memory, the speeds they are, the size and how many slots are available and how many are taken up. It will tell you software serial numbers, product keys, software inventory, hardware inventory, Network information, network tools, real-time monitors.  This program has it all! Best part is that you dont even have to install it, they have a standalone version, PortableApps version, and a U3 version.

http://www.gtopala.com/