Problems in access problems by different users

I have installed MS Office 2000 and Adobe Reader 6.0
using the status as Administrator. However, when I logon
with another user name, say "User" (with same status as
Administrator), the "User" cannot access to the above
mentioned applications. Instead, it prompts to insert
installation disc (for Office 2000) or show that a
program (journal viewer) cannot be accessed (for Adobe
Reader). Could anyone please advise me what happen?