the computer name is useless. That is a randomly generated series of letters and numbers used to differentiate that install of xp from several hundred others. Useful in a corporate environment, but not helpful to home users. I always change the name to something else on install so I can keep track of which machine is which on my network.
The number on the tag is indeed an IBM part number. It is the part number of an ibm thinkpad laptop. The number is also associated with the IBM part number that is listed as "32P4414-06, Windows XP Pro COA License Sticker "
The license key might be an oem issued under a large volume license to a corporation which was not too picky about which machine got which sticker.
Did you get the system at an auction or surplus sale? I am not sure where a legal copy of the media that goes with that key number might be located.
If it is an actual IBM hardware desktop, there has to be a model number on it somewhere.
Go to this page:http://www-307.ibm.com/pc/support/site.wss/MIGR-49QTT6.html
and look for " ThinkCentre, NetVista, Value Line, and other desktops "