Avast makes old program unavailable - how can I get it back?

I am running Microsoft Image Composer 1.5 on my laptop. For me this is a very valuable MS-program from 1998! Now my free Avast considered it so suspicious that it made it unavailable. Does someone know how I can get my program back and working? Many thanks in advance. R

You should be able to restore it from the virus chest.

Als report it as a false positive:
http://www.avast.com/contact-form.php