Sometimes you need to find out how much memory you have, what type of CPU, hard drive capacity, or even what software you have. What I do, and you should too, is install Belarc Advisor! It provides PC Technical-Specifications, PC technical information, and PC license keys. It is very good and Free, for personal use. 
Belarc Advisor builds a detailed profile of your:installed software and hardware,
missing Microsoft hotfixes,
anti-virus status
Software license keys and much more!
It displays the Technical-Specifications in your Web browser. All of your PC profile information is kept private on your PC and is not sent to any web server. 
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Operating Systems: Runs on Windows Vista, 2008, 2003, XP, 2000, NT 4, Me, 98, and 95. Both 32-bit and 64-bit Windows is supported.
Browsers: Requires IE 3 or Netscape 3, and higher versions. Also runs on Opera, Mozilla, and Firefox.
I use this for my PC's, and print a copy for my file, in case I lose data on my PC, from a virus, bad hard drive, etc.
If you do not have your XP License key, you can retrieve it with this handy tool. Belarc advisor. This tool also provides substantial detailed information that could be useful, if you have to reload XP.
I Recommend this for all my customers! It is free, and very useful, when you are trying to solve problems!
