Replying to Ilife 11 problems

Hey everyone.

I just got ilife 11 and was about to install it when I read that in some cases, Iphoto11 can corrupt your photo library and make iphoto unusable.

Has anybody had these problems? Should I risk installing it even with my photos backed up on an external hard drive?

Lastly. Can I only install the Imovie part of I life, or do you have to install anything at once?

Good help gets K.

Thanks