Hive: HKEY_CURRENT_USER
Key: Control
Panel\Desktop\
Name: PaintDesktopVersion
Type: REG_DWORD
Value: 0
Opps! Sorry - this hack does not work on W2K later than RC1.
One method to eliminate the build number is to turn on Active Desktop / Show Web Content option (right click desktop).
Tweakui has the option to eliminate the build number:
General|Effects|Show Windows Version on Desktop