need file for office 2000

I have Office 2000 on my system and it was there when I bought it . I have had system since feb25/02. I tried to update to new ms office but can;t find file data1.msi. I do not have the disks they were not with the system when I purchased. I purchased from a private source who does not have the disk either. I woud like to know if there is any way to get this file, and from whom? please and thank-you!