Best System Hardware Detection Software:

AIDA32 is a system information tool with full hardware & software information. It informs user about hardware physical information for CPU, motherboard, hard disks, optical drives, chipset and much more. It can display the information on-screen, print it, or save it as a report in various formats including HTML, CSV and XML.An easy to use report wizard allows you to create detailed reports in the format of your choice or save the information to a database. The program is extremely well featured and absolutely free*.It is also known as EVEREST Home Edition.

It can be run on any windows OS including 98/ME/2000/XP, but not fully compatible with windows vista.

*Earlier the makers of AIDA32 had this software's free version(EVEREST Home Edition)but now they have stopped it and they only have the corporate and ultimate editions of it,for more info check

But still if you want you may download AIDA32 older versions(sufficient enough)Here: