Getting file/access error - VB6 App. Help?

Hi:

I have an application that was developed a long time ago in Visual Basic 6.
I'm a developer who has been asked to do some minor upgrades to it and make it installable and workable in Windows 7.

This is for mass distribution so changing Windows 7 settings will not solve this problem for me.

It writes data to a pdf file, basically, it creates a pdf report.
It tries to write files to the (in VB) App.Path folder, which should be the folder that the application runs in, inside Program Files (x86).

I use the Windows installer (.msi) for installation and that seems to be working great.

I have Windows 7 but have relaxed the file access permissions. The application runs fine on XP and it runs fine on my machine.
However, everyone else who has Windows 7 cannot run it. They keep getting a file/access error when it tries to create the pdf report file.

How can I develop the application so that a customer can install it and we can be sure it will run (obviously, we can't change their Windows settings).

Have you tried having them run the install in Compatibility mode?

thanks for the reply.
No, I haven't. Part of the problem with that is the people who will buy/use this app will not know how and will not be inclined to try.

I'm sure this is a 'file write' problem. Is there anything I can do when creating the installation to help?
Is there maybe a different folder (with a system variable I can use??) that will permit the application to write and overwrite a file?