[I just posted this to 'General Questions' but this forum may be apter ...]

I wrote an application in Excel 2003 for a client with a four computer
network. The application is on a shared network drive, and it seems to work
correctly (Read/Write) for two of the machines. However, with no other users
accessing the application, the other two machines present Read-Only versions
of the application.

One of these machines uses Windows 2000 and Excel 2003 and displays
[Read-Only] behind the file name. The other machine uses Vista and Excel 2007
and displays [Read-Only] [Compatibility Mode]. Both of the machines that work
correctly use Windows XP Professional; one has Excel 2003 and the other Excel
2007.

Thinking that this might be a compatibility problem, I downloaded the MS
Compatibility Pack to the two 'Read-Only' machines. But in both cases I was
told that a different version of Windows Installer had been found, and I
needed to delete or modify the existing version using Add/Remove programs.
And the installation had failed.

I am unable to find Windows Installer listed on either machine at Add/Remove
programs.

Can anyone suggest my next steps?

Many thanks.

Mike