"File Corrupted" when opening FF2

As far as I know there is no problem using different versions of FF in the same computer (at least in the windows side) as I have also FF2 (that I never use anymore), FF3, and FF4b and have not had any problem with them.

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Do I need to simply reinstall FF2 now, or is this going to be an ongoing issue?

Well, I think that perhaps it may be a problem of just FF2, so reinstalling FF2 could perhaps repair and fix the corrupted or missing file or files

Sorry, just for curiousity, I wonder why do you want to have FF2 installed and still use it?

I mean that if you already have the FF3 from my point of view I do not see, from my point of view, any reason why I would go back to use FF2

As said this is just curiosity and you may have your own valid reasons to do it and I respect it