how do i keep QT7.2 when doing a re-install of OSX?

i'm trying to stay away from QT7.3 like that dragon-monster that tried to kill me in my dream when i was about 6 years old - i ran like hell into my parents bed....

alright alright, enough of the flashbacks... i want to reinstall my OS before installing FCS2 (since everyone thinks that's the best way to go). however, will i have problems getting QT7.2 back? is it something that should worry me? are there steps i can take to keeping QT7.2?

thanks fellas.

-edward