To re-install iPhoto
1. Put the iPhoto.app in the trash (Drag it from your Applications Folder to the trash)
2a: On 10.5: Go to HD/Library/Receipts and remove any pkg file there with iPhoto in the name.
2b: On 10.6: Those receipts may be found as follows: In the Finder use the Go menu and select Go To Folder. In the resulting window type
2c: on 10.7 they're at
A Finder Window will open at that location and you can remove the iPhoto pkg files.
If you purchased an iLife Disk, then iPhoto is on it.
If iPhoto was installed on your Mac when you go it then it’s on the System Restore disks that came with your Mac. Insert the first one and opt to ‘Install Bundled Applications Only.
If you purchased it on the App Store or have a Recent Mac you can find it in your Purchases List.
Thank you for you reply.
I'm quite new on my mac. So i have no idea where I can see on which version am I. I have no idea which way should I go (2a, 2b,2c). It means even though I re-install Iphoto, I will get all my photos back?
IPhoto was installed before, as someone gave it to me. So I have nothing on my own purchase list.
I'm sorry I feel a bit stupid