Help with going back to Iphoto 09 after using iphoto11
Ok so here is my problem, I have used iphoto 11 for a couple months and it just goes so slowly on my computer, and i just want to go back to iphoto 09. I have it reinstalled on my computer, but when i open it, it says "You have made changes to your photo library using a newer version of iPhoto. Please quit and use the latest version of iPhoto." I have tried to rebuild my iphoto library through iphoto and through iphoto library manager, still i keep getting the same error message. I have no idea how to get my library back into my old iphoto, also after giving me the error message the only option i have is to quit. Even if i try to open a brand new image in iphoto 09, it will not work. Help please!
If it makes any difference i am running osx10.6.8 and have around 9 thousand pictures in my iphoto library.
iMac, Mac OS X (10.6.8)