Install Xcode on Mac OS X 10.7.2

Hi Everyone,
I have bought a Mac mini with  Mac OS X 10.7.2. I am trying to install Xcode 4.2.1 on it through App store but the process stops as soon as it started with a message: "The Application cannot be downloaded The application you tried to download could not be downloaded. Check your internet connection and try again."
It's happening since saturday, so it's not a temporary problem as i initially thought.
Please help me with this.
Thanks in Advance.

OK, I'm running out of ideas. I've got two left!
1. Be careful with this. In the 'Debug' menu again, click on
Show Download folder...*
Click 'command-i' on your keyboard to open the 'Get Info' window. Look at the permissions at the bottom. They should be 'read & write' for your computer, and 'read' and 'read' for the other two. If the first one is 'read' only, that would stop any downloads. If so, change it (post back here for instructions if you don't know how to do that).
I wouldn't recommend messing with anything else in the Downloads folder, as I'm not sure what it might do, so if the permissions are OK just exit.
The second option's not very satisfying I'm afraid, but short of someone else joining in with any better ideas, go
2. Contact App Store support
http://www.apple.com/support/mac/app-store/applications/
(*Note: this is the App store download folder, not your ordinary dowload folder. You can only get to it through the debug menu.)
Message was edited by: softwater » added note

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