proplus.msi ERROR

HELLO!!

For a while now, I've been getting this after opening programs, such as AIM, Internet Explorer, Office programs. (Perhaps any program I open).

1) Please wait while Windows configures Microsoft Office XP Professional with Frontpage...
2) The feature you are trying to use is on a CD-ROM or other removable disk that is not available.

Insert the 'Microsoft Office XP Professional with Frontpage' disk and click OK.
After canceling this is the message:
3) Error 1706: Setup cannot find the required files. Check your connection to the network, or CD-ROM drive. For other potential solutions to this problem, see 'C:\Program Files\Microsoft Office\1033\SETUP.HLP

After clicking OK (without entering the CD):
3) The path 'Microsoft Office XP Professional with Frontpage' cannot be found. Verify that you have access to this location and try again, or try to find the installation package 'PROPLUS.MSI' in a folder from which you can install the product Microsoft Office XP Professional with Frontpage.
After

I've googled for the proplus.msi file. I have not tried re-installing Office because I do not have the CD and from I've read in other message boards, re-installation does not work anyway.

Can someone PLEASE help me get rid of this message? I'd super appreciate it! Thank you! =)

Lisa