Office 2000 after ugrading to XP

I recently upgraded a networked workstation from Windows 98 to XP Pro using the winnt32.exe file. After completing the upgrade successfully i logged on as an administrator to the network. Then i began testing the functionality of software previously installed on that machine. When i opened Word 2000 a box appeared asking for the product key then stated that the application functions i was trying to use were unavailable – please insert the disk. This a did and word worked without any problems for administrator. Then i logged on as a domain user. I received an office error message at log on that the application must be install before i can use it. However i still receive errors for domain users when i reinstall office from the same source cd. Any suggestions please.