I recently tried to instlal Sweet FX into fsx, but apparently must have done something wrong, as it crashed FSX, so I tried removing it.But in doing so I think I accidently removed something that is now causing some extra problems. I'm currently doing a repair install, and wondering if I have to reinstall aircraft and whatnot again once its done?

suppose  you didn't think of  doing  a system  restore  to before you had  troubles or if  you made  back up   copy of your  hard  drive?