Bon, ds un autre post, il m'a été onfirmé que le SP4 incluait les précédents SP.
 
je vais faire une install fraiche de win2000 SP4 : est il tjs utile d'isntaller après le Windows 2000 Application Compatibility Update ?
 
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Windows 2000 was specifically designed to allow customers to add additional application support easily after the product shipped. The March 2001 package is the sixth release of additional application support and it includes software compatibility updates for Windows 2000.  
The March 2001 package includes compatibility updates of the February 2001, October 2000, August 2000, May 2000, and February 2000 packages  
For More Information - http://www.microsoft.com/Windows20 [...] efault.asp  
Version - 1.6  
Release Date - 21 Mar 2001

Aucun interet, Microsoft le met a jour a chaque SP.

merci !