Hi Marc,

Thank you for your posting.

Based on my past experience, the ".IPI" is a temp file. To solve the
problem, I would suggest that you first clean your Temp Folder. To do this,
you may follow the steps below.

a. Click "Start" => Click "Run" => Type "%Temp%" in the open blank.
b. Press CTRL+A to select the contents of the folder.
c. Press DELETE.
Note: If you cannot delete all the selected files, delete as many of these
files as you can.
e. Close this window.

And "-2147287035" is a permissions error return. To solve this, please
reset the permissions on "%windir%\installer" and "%temp%".

As well, I would like to inform you that sometimes third-party software
applications will cause installation problems, especially the Anti-Virus
software. I hope that you could try to make a clean boot before installing
Visual Studio .NET 2003 Enterprise Architect. You may refer to the
following link to perform a clean boot.

How to Perform a Clean Boot in Windows XP
http://support.microsoft.com/?id=310353

Please try my suggestion and let me know the results at your earliest
convenience. Should you have any concerns regarding the issue, please feel
free to let me know.

Regards,

Wendy Dong
Microsoft Online Partner Support