Are you talking about the application in Windows 98 that gives you the option of locating a System file which will extract it if you want to replace one that is of the wrong version? If so yes Windows 2000 doesn't really have that. sfc in command prompt replaces that. Run in command prompt sfc /purgecache with your Windows 2000 CD-ROM in the drive. Do this in Start | Run | cmd sfc /purgecache | OK