Strange Permissions lead to having to reinstall Leopard...

Hey there, I've been having some interesting issues with my new iMac Intel Core 2 Duo with Leopard 10.5.1. The following has happened twice so far:
• Everything appears to be fine when I sleep my computer.
• The next time I go to wake it, the dock is clear. Weird.
• I repair my permissions using Disk Utility, which takes about 20 minutes, and finds quite a few errors (see movie).
• When I try to restart my computer, it won't get past the light blue screen (just before the desktop loads).
•I have to restart using the install disc and holding the "C" key to run Disk Utility (to fix permissions) reinstall Leopard (with an Archive & Install).
• Everything is fine when the install finishes.
Anyone have any idea of what's happening? It's really quite frustrating when I have to reinstall Leopard.
Here's a link to a video of what happened:
http://www.divshare.com/download/2877647-b2e
Sorry, but you'll have to download the video. Thanks for your time.

GrooveMachine,
You have a couple icons in the dock I don't recognize, the blue and white globe next to Word, and the black and white icon to the right of the Word icon. Do you have any third-party enhancement software? Any non-Apple login items? See here:
http://docs.info.apple.com/article.html?artnum=306857
Repair permissions only on the volume from which you're started up, not when booted from a different volume.
Restart in Safe Mode. Shut down, then immediately after pressing power button to start up press and hold the Shift key and keep holding it until login screen appears. Log in and finish startup.
Remove any non-Apple login items or enhancement software.
If there was any non-Apple software removed or disabled, restart normally and see if it works.
If not, reboot from Leopard DVD (with Leopard DVD in the drive hold down Option key on restart and keep holding, choose to start from Leopard DVD). Run Disk Utility and select Macintosh HD but do NOT repair permissions. Instead Repair Disk and if any errors are encountered, Repair Disk again until no errors reported.
Do you have admin privileges for yourself as user? If not, you should. If not, see here:
http://docs.info.apple.com/article.html?artnum=306876
If you are an admin user after you Repair Disk set startup disk to Macintosh HD and give it another try.
Let us know how it goes.

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