FSX Installer Issue

I'm trying to reinstall FSX after a system crash....I've reloaded all my other software w/o a hitch, when trying to put FSX back on, it loads all the way to the end of disk 2, then I get a "1722 error, problem with windows installer......"
I'm using XP, that was reloaded last week....
I need to fly
Any clues?
I'm using XP, that was reloaded last week....
I need to fly

Any clues?