iMovie has a question mark over the icon and will not open. Help!

Install it from your iLife or computer's original disk, using Pacifist if needed, and then run the latest applicable iMovie updater.

(53051)

Niel wrote:
Install it from your iLife or computer's original disk, using Pacifist if needed, and then run the latest applicable iMovie updater.

(53051)

Hello, I have a question mark on the dock where once were icons which were not opening for

iphoto and system preferences. If I

Install it from your iLife or computer's original disk, using Pacifist if needed, and then run the latest applicable iPhoto updater.

will it erase any photos I have on my computer?

I can't use Time Machine because I can't open System Preferences.