Upgrading 10.4 to 10.6.8 on intell based iMac

I have two 2006 imacs both intel based that have 10.4 loaded. I wish to upgrade to 10.6.8 Snow Leopard. It starts the installation just fine on both machines then half way through stops with an error message that "some files could not be installed" Restart and try again. After numerous restarts it happens each time. I have successfully installed the 10.6 on several machines in the past as old as these but never encountered this issue. What is going on and how can I get around this?

Has invited:

howapple - hello

Favor from:

Hello,

How much free space is on the Disk?

Have you done this yet?

"Try Disk Utility

1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.

2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)

*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*

3. Click the First Aid tab.

4. Select your Mac OS X volume.

5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."

http://docs.info.apple.com/article.html?artnum=106214

Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.

(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive & clear caches.)

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