I run Reader V9 on an XP system and on a Vista system. I recently completed and saved some tax forms downloaded from the IRS.gov site to my XP system. No problem entering data and saving it, nor re-opening and making and saving further changes to the forms. However, on the Vista system, upon opening the same forms, I immediately get the message that the ability to saving data is disabled. What/why the difference, and can anything be done to enable the capability on the V9 running on my Vista system?