Xcode 3.2.6 and ios sdk installation failed

I downloaded the xcode_3.2.6_and_ios_sdk_4.3.dmg , and try to install the xcode and sdk.

But it failed so many times.....

The installer said "Installation failed " "An unknown error occured"

And Every time I reload the installer  , the console got the message "The domain/default pair of (com.apple.iPhoneSDKInstaller, showAdvancedInstaller) does not exist"..

 

Someone please help me . I tried so many times and download the .dmg many times..

and reinstall the MAC OS X system two times. And still the same problem.

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