Where is system events? System Events.app? Installer?

I successfully cloned my old internal 160 GB HD to a newer 500 GB drive. Successfully removed the old drive and installed the new one. OS 10.6 cleanly came up, albeit a little bit longer than I expected.

I have three issues that popped up on my startup. Three dialog boxes, asking me:
Choose application - Where is System Events.app?
Choose application - Where is System Events?
Choose application - Where is Installer?

First, what should I choose for these three questions?
Second, any ideas what happened in the transition/cloning process? I used the current version of SuperDuper and it reported no errors.