Well, if you know the history of NT Operating systems, then NT 4.0 was being developed into a new operating system. It was going to be called NT 5, but by the time it was out on stores, they called it Windows 2000. This was also the predecessor of XP, and since it follows the file-system and memory structure of NT/2000, it is detected as NT, version 5.1 build 2600, if you have Service Pack 1.
A little combersome, but still an explanation
A+ Core Hardware, Software Certified (May 13 2005)
the new beast...
AMD Athlon XP 3200+ Barton running at 2.16 Ghz.
GeForce MX 4000 (mainly takes the load off the main system)
Creative Labs Audigy 24-bit sound.
Some Case from tigerdirect
512 MB Ultra DDR RAM.
80GB Seagate HDD
LiteOn CD-RW / DVD ROM drive.
currently looking at a litescribe drive at staples, due to its ability to label the CD shortly after being burned.