Mounting .dmg files?

Dear Forum,
Having imported the .dmg files from DVD.
I'm unable to install CS3 .dmg files on my Mac G5.
With the .dmg in the applications folder I double click on the .dmg file in finder. The file appears to mount. Then in finder Go I select computer and double click on the CS3 Icon.Then the setup Icon appears I double click on it and a window appears saying "System Requirements Error This software cannnot be installed because the file system of the OS Volume is not supported".
Assistance please.

O.K. I know this sounds weird.
I'm planning to do a clean install of Leopard with the Internal HD formatted with Mac OS Extended (Journaled)
There are 2 HD Icons in Disk Utility. 1. Mac HD 2. 149.1 GB Samsung SP1614C
When I highlight the Mac HD Icon in Disk Utility and select Erase the Mac HD reads as Mac OS Extended (Journaled) The only option highlighted if Erase Free Space.
When I highlight the 149.1 GB Samsung SP1614C Icon in Disk Utility and select erase the Samsung reads as Mac OS Extended (Case Sensitive Journaled) There are no options highlighted.
Can you explain that?

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*" I am suing Mac Leopard 10.5.6..I download skype from its official website, and I can't mount the DMG file."*
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Copyright 1994-2001 Apple Computer Inc.
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They sometimes say you're better helping yourself!
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Copy file from mounted DMG to the Applications folder?

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Mounting .dmg files?

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