Unfortunately, I myself have run into this problem on more occassions than one.
My solution to this is to scrap the damn thing and go get a different version. If the version you have is the ONLY ONE around, then you have to do the unthinkable and go edit the airfile!!!

To do this, you'll need AirEd, which is by far the easiest prog to use when editing these dang things. Find it
here.
The biggest problem is finding the right entry section to edit. There are loads of forums out there that will teach you all about editing airfiles (if you have the time and patience

), so try checking the link in my signature titled "Airfile Editors". That should take you to some forums for a little help.
Good Luck,
Locke