How to restore my iPhone apps into new iTunes library ??

I formated my PC recently and forgot to backup my iTunes library,when new login to iTunes on formated PC, the "Apps" page still can see all my Iphone Apps that installed before but all the apps icon on right hand side show in non active icon, when I tick the "Sync Apps" on the top left corner, the box "Are you want to Sync apps ? All existing apps and their data on the iphone " x's iphone" will be replace with apps from this iTunes library" , means if i click "Sync Apps" all my previous apps will gone !!! Anybody know how to restore the apps from my iPhone to iTunes library, so i can continue to Sync new apps while maintain my old apps.

Thanks You Very Much